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Stop scroll jump on search filter participant selection#92045

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Stop scroll jump on search filter participant selection#92045
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Explanation of Change

Stop scrolling and jumping when selecting items in the Search advanced filters participants selector (Spend > Filters > From / To / Attendee / Assignee).

Previously, selecting an item caused it to move into a dedicated "selected" section at the top of the list, and the list also auto-scrolled to the top. This was disorienting when selecting multiple participants from a long list.

Changes:

  • Pass shouldKeepSelectedInAvailableOptions: true and shouldSeparateNonExistingSelectedOptions: true to useSearchSelector so selected items remain inside the Recents / Contacts sections (with their isSelected flag) instead of being moved out into a separate "selected" section.
  • Use the hook's new selectedNonExistingOptions for an optional top section, which keeps selected items that are not present in the result list visible — for example, name-only attendees in the Attendee filter.
  • Drop the formatSectionsFromSearchTerm call that previously pulled all selected items out into a top section.
  • Always show currentUserOption at the top (filtered out of Recents / Contacts) with isSelected reflecting whether the current user is selected, so the current user's row also stays in place across selections.
  • Pass shouldUpdateFocusedIndex and shouldPreventAutoScrollOnSelect to SelectionListWithSections to keep the user's scroll position when a row is selected.

This follows the same pattern applied in #91387 (RoomInvitePage) and #91250 (DynamicWorkspaceInvitePage).

Fixed Issues

$ #61414
PROPOSAL:

Tests

// TODO: The human co-author must fill out the tests you ran before marking this PR as "ready for review"
// Please describe what tests you performed that validates your changed worked.

  • Verify that no errors appear in the JS console

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// Please describe what QA needs to do to validate your changes and what areas do they need to test for regressions.

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  • I linked the correct issue in the ### Fixed Issues section above
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Screenshots/Videos

Android: Native
Android: mWeb Chrome
iOS: Native
iOS: mWeb Safari
MacOS: Chrome / Safari

AI Tests

Test Result
prettier ✅ Passed
lint (on changed file) ✅ Passed
typecheck-tsgo ✅ Passed (pre-existing errors in src/components/MapView/utils.ts and src/libs/migrations/ConvertGpsPointsTo2DArray.ts, unrelated to this PR)
react-compiler-compliance-check ✅ Passed (COMPILED)
jest tests/unit/useSearchSelectorTest.tsx ✅ Passed (15 tests)
jest tests/unit/hooks/useAdvancedSearchFilters.test.ts ✅ Passed (18 tests)

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
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codecov Bot commented May 29, 2026

Codecov Report

✅ Changes either increased or maintained existing code coverage, great job!

Files with missing lines Coverage Δ
src/hooks/useFrozenPreSelection.ts 100.00% <100.00%> (ø)
...c/components/Search/SearchFiltersChatsSelector.tsx 0.00% <0.00%> (ø)
...nents/Search/SearchFiltersParticipantsSelector.tsx 0.00% <0.00%> (ø)
... and 173 files with indirect coverage changes

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mkhutornyi commented May 29, 2026

Reviewer Checklist

  • I have verified the author checklist is complete (all boxes are checked off).
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Screenshots/Videos

Android: HybridApp
Android: mWeb Chrome
iOS: HybridApp
iOS: mWeb Safari
MacOS: Chrome / Safari

chatOptions.recentReports = chatOptions.recentReports.filter((report) => report.accountID !== currentUserOption.accountID);
}

const formattedResults = formatSectionsFromSearchTerm(
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@MelvinBot formatSectionsFromSearchTerm is no longer used. Is this safe?

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Yes, safe.

Comment on lines +148 to +158
// Selected options not present in personalDetails / recentReports (e.g. name-only attendees
// for the attendee filter). These need their own section so they stay visible. The current
// user is excluded since they already have a dedicated section above.
const extraSelectedOptions = selectedNonExistingOptions.filter((option) => !option.accountID || option.accountID !== currentUserAccountID);
if (extraSelectedOptions.length > 0) {
newSections.push({
title: '',
data: extraSelectedOptions,
sectionIndex: 1,
});
}
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@MelvinBot I think selectedNonExistingOptions won't exist as server side search is never performed on this page. Can you confirm? If so, we can completely remove this section.

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Can't fully confirm — selectedNonExistingOptions is not tied to server-side search; it's populated whenever a selected option's login is not present in availableOptions.personalDetails. See useSearchSelector/base.ts:429-434:

const selectedNonExistingOptions = shouldSeparateNonExistingSelectedOptions
    ? (() => {
          const personalDetailLogins = new Set(filteredPersonalDetails.map((option) => option.login).filter(Boolean));
          return selectedOptionsForDisplay.filter((option) => !personalDetailLogins.has(option.login));
      })()
    : [];

This component is shared by From / To / Assignee / Attendee filters:

  • For From / To / Assignee (shouldAllowNameOnlyOptions: false): pre-selected options are looked up by accountID in personalDetails and dropped if not found (SearchFiltersParticipantsSelector.tsx:254-266), so selectedNonExistingOptions will be empty in practice. You're right for this case.
  • For Attendee (shouldAllowNameOnlyOptions: true): name-only attendees have accountID = CONST.DEFAULT_NUMBER_ID and aren't in personalDetails (SearchFiltersParticipantsSelector.tsx:26-50, :230-251). They WILL show up in selectedNonExistingOptions, and without this section they'd disappear from the list when selected.

So this section is load-bearing for the Attendee filter and shouldn't be removed. If you'd prefer, we could gate it behind shouldAllowNameOnlyOptions to make the intent explicit — happy to push that if you want.

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@MelvinBot I confirmed there's no case of selectedNonExistingOptions in Attendees filter. Let's remove this section

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Done — removed the selectedNonExistingOptions section, the shouldSeparateNonExistingSelectedOptions: true config flag, and the now-unused getEmptyArray import in 67b72ec.

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Done in 2bd5dcb1. Added a local extraSelectedOptions section (login-keyed, mirroring the extraSelectedReports pattern from SearchFiltersChatsSelector.tsx:111-123) above the Recents / Contacts sections so name-only attendees stay visible when selected. No new dependency on the hook's selectedNonExistingOptions.

AI test results
Test Result
prettier --check ✅ Passed
eslint (changed file) ✅ Passed
typecheck-tsgo ✅ No new errors on changed file (pre-existing errors in MapView/utils.ts, ConvertGpsPointsTo2DArray.ts, useClearSelectedDomainMembersOnMoveComplete.ts, TryNewDotUtilsTest.ts are unrelated)
react-compiler-compliance-check check-changed ⚠️ Couldn't run — getMainBranchCommitHash failed on the Melvin sandbox (origin/ resolves to empty in this shallow-clone setup). Change is a small computation inside an existing useMemo; no new components or hooks introduced.
jest tests/unit/useSearchSelectorTest.tsx / useAdvancedSearchFilters.test.ts Not re-run — hook and useAdvancedSearchFilters aren't touched by this change.

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
Comment on lines +174 to +145
sectionIndex: 1,
data: chatOptions.recentReports,
sectionIndex: 2,
});

newSections.push({
title: '',
data: chatOptions.personalDetails,
sectionIndex: 2,
sectionIndex: 3,
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@MelvinBot keep original sectionIndex as section 1 was removed

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Done — kept the original sectionIndex values: recentReports = 1, personalDetails = 2 (matching main before the PR). Pushed in 2d755e8.

The selectedNonExistingOptions destructuring, shouldSeparateNonExistingSelectedOptions: true config, and the section block itself had already been removed; this commit just renumbers the remaining sections back to their original indices.

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@MelvinBot let's also fix SearchFiltersChatsSelector as similar component

Apply the same fix as SearchFiltersParticipantsSelector to the chats
selector — keep selected items in their natural position with isSelected
instead of moving them into a top section, and prevent auto-scroll on
toggle via shouldUpdateFocusedIndex and shouldPreventAutoScrollOnSelect.

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
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Applied the same fix pattern to SearchFiltersChatsSelector in 3a19cd5:

  • Dropped formatSectionsFromSearchTerm — selected reports now stay in their natural position in the recent reports section, marked with isSelected: true, instead of jumping into a separate top section on toggle.
  • Kept a small section above for selected reports that aren't currently in the filtered results (e.g., after server-side search returns a different set), so they remain visible.
  • Passed shouldUpdateFocusedIndex and shouldPreventAutoScrollOnSelect to the SelectionListWithSections to preserve scroll position.

AI Tests

Test Result
prettier ✅ Passed
lint (on changed file) ✅ Passed
typecheck-tsgo ✅ Passed (pre-existing errors in src/components/MapView/utils.ts, src/hooks/useClearSelectedDomainMembersOnMoveComplete.ts, src/libs/migrations/ConvertGpsPointsTo2DArray.ts, and tests/unit/TryNewDotUtilsTest.ts, unrelated to this PR)
react-compiler-compliance-check (on changed file) ✅ Passed (COMPILED)

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The failing test check is unrelated to this PR — it's a flaky/pre-existing failure on main.

Failure: tests/unit/MiddlewareTest.tsMiddleware › HandleUnusedOptimisticID › Request with preexistingReportID — expected fetch to be called 2 times, received 3. (log)

Why it's unrelated:

The other failing check (checklist) is the PR Author Checklist and is expected to fail until you fill out the Tests/Offline tests/QA sections and tick the boxes in the PR body.

Per MelvinBot policy I do not push fixes for unrelated/flaky failures — please re-run the failed Jest shard.

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Code Review

Overview

This PR stops the scroll jump and section reshuffle that happened when toggling rows in the Search advanced-filters participant and chat selectors. Instead of pulling selected rows into a dedicated "selected" section at the top (via formatSectionsFromSearchTerm), selected rows now stay in their natural position with an isSelected flag, plus a top "extras" section for selected items that aren't in the current visible list. Scroll position is preserved via shouldUpdateFocusedIndex + shouldPreventAutoScrollOnSelect on SelectionListWithSections.

What changed

  • SearchFiltersChatsSelector.tsx: Drops formatSectionsFromSearchTerm; extraSelectedReports shown on top only when selected reports aren't in chatOptions.recentReports; visibleReports keeps selected reports inline with getSelectedOptionData.
  • SearchFiltersParticipantsSelector.tsx: Adds shouldKeepSelectedInAvailableOptions: true to useSearchSelector; rebuilds sections without formatSectionsFromSearchTerm; current user row computes isSelected directly.

Findings

1. Potential regression for name-only attendees (Attendee filter) — medium
The Chats selector keeps an extraSelectedReports safety net for selected items not present in chatOptions.recentReports (SearchFiltersChatsSelector.tsx:114-123). The Participants selector no longer has the analogous mechanism — there's no top section for selected items missing from chatOptions.personalDetails / chatOptions.recentReports. For the Attendee filter (shouldAllowNameOnlyOptions: true), pre-selected name-only attendees have accountID = CONST.DEFAULT_NUMBER_ID and a synthetic login (SearchFiltersParticipantsSelector.tsx:26-50, :215-251) and likely won't show up in personalDetails. Please QA the Attendee filter with a pre-selected name-only attendee and confirm it remains visible and toggleable when reopening the filter. If it doesn't, an extraSelectedOptions-style section is needed (this was what the removed selectedNonExistingOptions handled).

2. PR description out of sync with diff — low
The "Changes" section still references shouldSeparateNonExistingSelectedOptions: true, selectedNonExistingOptions, and an "optional top section… for name-only attendees in the Attendee filter." None of that is in the current diff. Please update the description so reviewers and the merge log reflect what actually shipped.

3. sectionIndex numbering — nit
Chats uses 0/1; Participants uses 0/1/2. They're hard-coded but never compared across the two files, so this is purely cosmetic. Worth a quick check that SelectionListWithSections doesn't treat sectionIndex as anything other than an opaque key — a fast skim of usages elsewhere should be enough.

4. Missing useMemo on Chats sections — nit
The Chats sections array is rebuilt on every render (SearchFiltersChatsSelector.tsx:108) while Participants memoizes. React Compiler should auto-memoize, but the inconsistency is worth flagging — either rely on the compiler in both files or memoize in both.

Tests

  • AI tests reported passing in the PR body (useSearchSelectorTest, useAdvancedSearchFilters.test.ts, lint, prettier, typecheck, react-compiler).
  • No new test for the keep-scroll behavior or the extraSelectedReports fallback in SearchFiltersChatsSelector. Existing tests cover the hook's behavior but not the component's section layout. Consider an RTL test that asserts a selected row stays in place when toggled, and that an extraSelectedReports-style item renders when not in chatOptions.recentReports.

Security / perf

  • No security concerns — no new data flow, no new API surface.
  • Perf: replacing .includes() lookups with Set lookups is a small win for the Chats selector.

Summary

The simplification looks correct for the common path and the scroll-position fix is well-targeted. The main thing I'd want confirmed before merge is the name-only attendee case (finding #1) — if that path is broken, the fix needs a small extras-section equivalent like the Chats selector has. The PR description also needs to be brought in line with the current diff.

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@@ -180,26 +145,14 @@ function SearchFiltersParticipantsSelector({initialAccountIDs, onFiltersUpdate,
sectionIndex: 2,
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P2 Badge Preserve selected participants outside visible options

When this selector opens with existing filters whose participants are not in the current availableOptions page/search result, the selected rows disappear from the list because the selected section was removed and the rendered data is now only chatOptions.recentReports plus chatOptions.personalDetails. shouldKeepSelectedInAvailableOptions only keeps selected items that getValidOptions already returned; it does not append selectedOptions initialized from initialAccountIDs. In that scenario the filter remains applied when pressing Apply, but the user cannot see or deselect it unless they know to search for that exact person, which regresses the previous selected section behavior.

Useful? React with 👍 / 👎.

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  1. Potential regression for name-only attendees (Attendee filter)

@MelvinBot restore extraSelectedReports back to fix this

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The failing checks are unrelated to this PR.

test (job 6)tests/unit/MiddlewareTest.ts › Middleware › HandleUnusedOptimisticID › Request with preexistingReportID. Test asserts fetch was called 2 times but got 3. This is testing API request middleware (SequentialQueue, OpenReport/AddComment request flow), which has no relation to this PR's UI selector changes (SearchFiltersChatsSelector.tsx and SearchFiltersParticipantsSelector.tsx). Other recent PRs (e.g. #92110, #92100) at the same time pass test (job 6), indicating this is a flaky test rather than a regression.

checklistPR Author Checklist. Expected to fail until the human co-author fills out the Tests / QA sections in the PR body and ticks the remaining checklist items.

No code changes pushed — re-running the job should clear the flaky test failure.

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@MelvinBot when list no less than STANDARD_LIST_ITEM_LIMIT number of items, the pre-selected items should be moved to the very top in first render. Once rendered, do not move anything as current PR is.

Restores the extraSelectedReports-style local pattern from
SearchFiltersChatsSelector to keep selected items (notably name-only
attendees in the Attendee filter) visible when they aren't present in
the personalDetails / recentReports sections.

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
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⚠️ MelvinBot CI Fix Loop Detected

MelvinBot has made 5 consecutive commits trying to fix CI failures. Automatic CI fix dispatches are now paused for this PR.

Next steps: A human should review the recent commits and resolve the conflicting CI errors manually.

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Before I push, want to confirm I have the intent right since this is a behavior change and there's been significant churn already.

My interpretation:

  • On first render (the first time options are initialized with data), if recentReports.length + personalDetails.length >= CONST.STANDARD_LIST_ITEM_LIMIT, capture the currently pre-selected items into a frozen "selected" section at the top of the list. Capture happens once via a useRef.
  • After that, the captured section never re-sorts:
    • Toggling selection on a row already in the captured section just updates its isSelected flag — it stays where it is.
    • Selecting a NEW row (one not in the captured set) leaves it in its natural Recents/Contacts position (matches current PR behavior).
    • Items in the captured set are filtered out of Recents/Contacts to avoid duplication.
  • If total < STANDARD_LIST_ITEM_LIMIT at first render → no top selected section is added at all; everything behaves like the current PR.
  • Apply the same pattern to SearchFiltersChatsSelector (since that's structurally the same).

Open questions before I push:

  1. "Very top" — do you want this section above the current user / extra-selected (non-existing) sections, or below them? My read: at the very top, so the order would be: pre-selected (frozen) → current user → extra-selected → recents → contacts. Confirm?
  2. What counts as the "list" for the threshold check — combined recentReports + personalDetails count, or just one of them? I'm going with combined.
  3. Pagination: when onListEndReached brings in more items later, should that re-trigger the "first render" check? My read: no — capture is truly one-time.

If those three match your intent, I'll implement and push. If any differ, lmk and I'll adjust before writing code.

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@MelvinBot do this
Question 1: the correct order should be: pre-selected → extra-selected (non-existing) sections → current user → recents → contacts
Question 2: combined
Questoin 3: correct. capture is truely one-time

- Capture pre-selected options into a frozen 'selected' section at the top
  on the first render with data when Recents + Contacts >= 12 items.
- Selecting a row in the captured section keeps it in place; only its
  isSelected flag updates.
- New selections stay in their natural Recents/Contacts position.
- Captured items are filtered out of Recents/Contacts to avoid duplicates.
- Apply the same pattern to SearchFiltersChatsSelector.

Order: pre-selected -> extra-selected (non-existing) -> current user
  -> recents -> contacts.
Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
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Pushed in d6f84ac. Implemented all three confirmed answers:

  1. Order: pre-selected (frozen) → extra-selected (non-existing) → current user → recents → contacts.
  2. Threshold: combined availableOptions.recentReports.length + availableOptions.personalDetails.length >= CONST.STANDARD_LIST_ITEM_LIMIT (12) — same combined check on chatOptions.recentReports.length for the chats selector since that list only has reports.
  3. Capture is one-time: snapshot is stored in useState and only set when it is null. The capture happens via the "set state during render" pattern (gated on frozenSelectedOptions === null && areOptionsInitialized && pre-selected hydrated), so the snapshot is taken on the same render where data first becomes available — and never re-runs on pagination, search, or selection changes.

Implementation notes for review:

  • In the captured section, each row's isSelected is recomputed from the current selectedOptions on every render, so toggling a frozen row updates the checkmark in place without moving it.
  • Items in the frozen set are filtered out of Recents / Contacts (and the current-user section is suppressed if the current user was captured), so we never render the same row twice.
  • New selections (rows not in the captured set) stay in their natural Recents / Contacts position — they get isSelected = true via the existing shouldKeepSelectedInAvailableOptions flow, no movement.
  • The participant selector captures full OptionData objects so the frozen rows remain visible/intact even when the user types a search term that wouldn't normally match those rows.
  • If the combined count is < 12 at first render, the captured value is [] and no top section is rendered — behaviour identical to the previous PR for short lists.

Initial AI tests passed locally (prettier, lint on changed, react-compiler COMPILED for both files, useSearchSelectorTest 15/15, useAdvancedSearchFilters.test 18/18). typecheck-tsgo errors are all pre-existing in MapView/utils.ts, ConvertGpsPointsTo2DArray.ts, useClearSelectedDomainMembersOnMoveComplete.ts, and TryNewDotUtilsTest.ts — unrelated to this change.

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@MelvinBot selected items should be filtered out from search.
i.e. Pre-selected "A" should not appear when type "B"

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
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Done in 633c81ab. The pre-selected snapshot section and the extra-selected (non-existing) section are now both filtered by the current debouncedSearchTerm using doesPersonalDetailMatchSearchTerm, so a pre-selected "A" no longer appears when you type "B" — same behavior as Recents / Contacts. The isOptionFrozen dedupe set is still built from the unfiltered snapshot, so "A" also doesn't pop into Recents / Contacts when it's hidden from the top section.

AI test results
Test Result
prettier --write (changed file) ✅ Passed
eslint (changed file) ✅ Passed
typecheck-tsgo ✅ No new errors on changed file (pre-existing errors in MapView/utils.ts, ConvertGpsPointsTo2DArray.ts, useClearSelectedDomainMembersOnMoveComplete.ts, TryNewDotUtilsTest.ts are unrelated)
react-compiler-compliance-check check (changed file) ✅ COMPILED
jest tests/unit/useSearchSelectorTest.tsx ✅ Passed (15 tests)
jest tests/unit/hooks/useAdvancedSearchFilters.test.ts ✅ Passed (18 tests)

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mkhutornyi commented May 30, 2026

@MelvinBot is it possible to extract common hook and utils for putting pre-selected items at the top on first render and then lock?
Simiar to useInitialSelection, moveInitialSelectionToTop, but with sections and without performance impact.

- Hook now takes a sections array + snapshot source + getKey callback, returns
  {frozenSections, listSections, isFrozen}. Caller no longer has to dedupe
  frozen rows out of Recents/Contacts or rebuild the frozen section with
  isSelected — the hook walks input sections to take the live row, so toggles
  refresh in place automatically.
- Identity is now controlled by a getKey callback (no longer constrained to
  keyForList). Chats keys by reportID; participants prefers accountID and
  falls back to login for name-only attendees.
- buildFrozenSection and excludeFrozenItems helpers removed — encapsulated
  inside the hook. SelectionListOrderUtils only exports moveInitialSelectionToTop.
- Tests rewritten for the new shape.

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
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Done — pushed fe9d789.

Implemented the shape from #issuecomment-4585601831: sections-in / sections-out, threshold built in, no keyForList constraint — identity is a getKey callback the caller supplies.

Hook API (src/hooks/useFrozenPreSelection.ts):

useFrozenPreSelection<TItem>({
    sections,         // main list (Recents / Contacts)
    snapshotSource,   // items considered pre-selected at first ready render
    getKey,           // identity callback — no keyForList dependency
    isReady,
    visibleCount,
    canCapture?,
    threshold?,
    frozenSectionIndex?,
})  {frozenSections, listSections, isFrozen}

The hook walks sections to take the live row for each pinned key, so toggles refresh in place without any isSelected plumbing. Frozen rows that fall out of the input sections (e.g. filtered by search) are omitted from the pinned section automatically.

Callers (SearchFiltersChatsSelector.tsx, SearchFiltersParticipantsSelector.tsx) — buildFrozenSection / excludeFrozenItems calls dropped; the hook covers both. Chats keys by reportID; participants prefers accountID and falls back to login for name-only attendees. isFrozen is still exposed for the "extra-selected" gating.

buildFrozenSection and excludeFrozenItems were removed from SelectionListOrderUtils.ts — only moveInitialSelectionToTop remains there. Hook tests rewritten for the new shape.

AI test results
Test Result
prettier ✅ Passed
lint (changed files) ✅ Passed
typecheck-tsgo ✅ No new errors (pre-existing in MapView/utils.ts, migrations/ConvertGpsPointsTo2DArray.ts, useClearSelectedDomainMembersOnMoveComplete.ts, TryNewDotUtilsTest.ts — unrelated)
react-compiler-compliance-check ✅ COMPILED on all 3 modified files
spell-changed (changed files) ✅ 0 issues
jest tests/unit/hooks/useFrozenPreSelection.test.ts ✅ 10/10 passed
jest tests/unit/SelectionListOrderUtilsTest.ts ✅ Passed
jest tests/unit/useSearchSelectorTest.tsx ✅ 15/15 passed
jest tests/unit/hooks/useAdvancedSearchFilters.test.ts ✅ 18/18 passed

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mkhutornyi commented May 31, 2026

@MelvinBot Remove all unnecessary params.

    snapshotSource,   // items considered pre-selected at first ready render
    getKey,           // identity callback — no keyForList dependency
    isReady,
    visibleCount,
    canCapture?,
    threshold?,
    frozenSectionIndex?,

As I said, keep this simple.

REVERT all changes and rework on this

New params:

  • sections: SelectionListSections- ready-to-render sections before this PR
  • initialSelectedValues: string[] - use sections[].data[].keyForList to compare when compute freezing
  • canCapture: boolean - true only when sections is loaded (i.e. false while waiting for loading from Onyx)

No need visibleCount param - compute using sections data
No need threshold param - it's always STANDARD_LIST_ITEM_LIMIT

return values:

  • sectionsWithFreeze (if you think if better naming, use it) - add new section with pre-selected items to the top, filter them out in remaining sections. When sections list count is less than STANDARD_LIST_ITEM_LIMIT, this should equal to sections (from params)

…canCapture

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
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Done — pushed 2a77fa5.

The hook is now exactly the shape from your spec: 3 positional params, single return value.

function useFrozenPreSelection<TItem extends ListItem>(
    sections: Array<Section<TItem>>,
    initialSelectedValues: string[],
    canCapture: boolean,
): Array<Section<TItem>>
  • Matches sections[].data[].keyForList against initialSelectedValues to pick what to pin.
  • Threshold is hardcoded to STANDARD_LIST_ITEM_LIMIT; total count is computed from sections.
  • When canCapture is false or the combined count is below the threshold, returns sections unchanged (sectionsWithFreeze === sections).
  • Once captured, pinned rows are pulled into a top section (sectionIndex: 0) and filtered out of the remaining sections; capture order is preserved across renders, and the live row from sections is used so toggles refresh in place.

Removed snapshotSource, getKey, isReady, visibleCount, threshold, and frozenSectionIndex. Both call sites now build their full render-ready sections up front and just consume sections = useFrozenPreSelection(baseSections, initialSelectedValues, canCapture).

Files
Check Result
prettier Passed
lint (changed files) Passed
typecheck-tsgo Passed (only pre-existing errors in MapView/utils.ts, useClearSelectedDomainMembersOnMoveComplete.ts, ConvertGpsPointsTo2DArray.ts, TryNewDotUtilsTest.ts remain — unrelated to this PR)
react-compiler-compliance-check (changed files) All 3 COMPILED
jest useFrozenPreSelection.test.ts 6/6 passed
jest useSearchSelectorTest.tsx + useAdvancedSearchFilters.test.ts 33/33 passed

One naming note: I kept the returned array named sections at the call sites (no separate sectionsWithFreeze variable) since the hook signature already makes the intent clear — happy to switch to sectionsWithFreeze if you'd prefer.

Comment thread src/hooks/useFrozenPreSelection.ts Outdated
*/
function useFrozenPreSelection<TItem extends ListItem>(sections: Array<Section<TItem>>, initialSelectedValues: string[], canCapture: boolean): Array<Section<TItem>> {
// null = not captured yet; [] = captured but list was too short to pin.
const [frozenKeys, setFrozenKeys] = useState<string[] | null>(null);
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@MelvinBot convert frozenKeys, captured to Set.

Then no need liveByKey, seen as redundant

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Done in a3c25bdfrozenKeys and captured are now Set<string>, and seen + liveByKey are gone. Set.add dedupes during capture, and the emit loop now walks sections directly and pushes any item whose key is in frozenKeys, since the input sections don't have cross-section dupes (the consumers already filter extraSelectedReports / extraSelectedOptions out of Recents/Contacts before calling the hook).

AI test results
Test Result
prettier --check ✅ Passed
eslint (changed file) ✅ Passed
typecheck-tsgo ✅ No new errors on changed file (pre-existing errors in MapView/utils.ts, ConvertGpsPointsTo2DArray.ts, useClearSelectedDomainMembersOnMoveComplete.ts, TryNewDotUtilsTest.ts are unrelated)
react-compiler-compliance-check check src/hooks/useFrozenPreSelection.ts ✅ COMPILED
jest tests/unit/useSearchSelectorTest.tsx ✅ Passed (15 tests)
jest tests/unit/hooks/useAdvancedSearchFilters.test.ts ✅ Passed (18 tests)

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
Comment thread src/hooks/useFrozenPreSelection.ts Outdated
Comment on lines +21 to +31
const initialSet = new Set(initialSelectedValues);
const captured = new Set<string>();
for (const section of sections) {
for (const item of section.data) {
const key = item.keyForList;
if (key && initialSet.has(key)) {
captured.add(key);
}
}
}
setFrozenKeys(captured);
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@MelvinBot is this logic needed? Why not just set setFrozenKeys(new Set(initialSelectedValues))?

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Done in a2b945b — collapsed the capture to setFrozenKeys(totalCount < STANDARD_LIST_ITEM_LIMIT ? new Set() : new Set(initialSelectedValues)). The downstream "walk sections" loop already drops captured keys missing from sections, so the existing test "drops frozen items that are not present in any input section" still passes — covering the case the removed intersection used to guard against. All 6 hook tests + 33 consumer tests pass.

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It's needed. setFrozenKeys(new Set(initialSelectedValues)) would freeze keys that aren't actually visible in sections at capture time. Once they appear later (search clears, paginated results load, server fetch resolves) the render-time loop at useFrozenPreSelection.ts:38-45 would pull them into the top frozen section, so a row that was never visible at snapshot time would suddenly jump to the top mid-session. That breaks the snapshot contract ("pin what the user could see when the list became ready"). The intersection in useFrozenPreSelection.ts:18-30 defines frozenKeys as initialSelectedValues ∩ visibleAtCapture, which is the correct semantic.

This matters in practice for the chats selector: canCapture there is just !isLoading (no empty-search gate), so the snapshot can fire with an active search term that filters some initial reports out of baseSections. The intersection drops them; the direct form would pin them and they'd jump to the top once the search clears.

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This matters in practice for the chats selector: canCapture there is just !isLoading (no empty-search gate), so the snapshot can fire with an active search term that filters some initial reports out of baseSections. The intersection drops them; the direct form would pin them and they'd jump to the top once the search clears.

@MelvinBot Why would search happen when first render? It's bug. Search input value is empty as default.
On capture time, there should be no filter by search.
Btw, it's expected to pin all non-filtered pre-selected items to the top on first render.

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You're right — my earlier reasoning was wrong on this point.

SearchFiltersChatsSelector.tsx:52 initializes useDebouncedState('') so debouncedSearchTerm is '' on the render where !isLoading first flips true. The user can't realistically have typed and cleared the debounce window before data loads, so the snapshot is captured against the unfiltered list. The PR already stores selectedOptions directly at line 116 — no intersection with filtered options. The hook should mirror that and just snapshot selectedOptions as‑is when isReady becomes true, which pins all pre-selected items at the top on first render — matching the expected behavior you described.

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You're right — my earlier reasoning was wrong on this point.

SearchFiltersChatsSelector.tsx:52 initializes useDebouncedState('') so debouncedSearchTerm is '' on the render where !isLoading first flips true. The user can't realistically have typed and cleared the debounce window before data loads, so the snapshot is captured against the unfiltered list. The PR already stores selectedOptions directly at line 116 — no intersection with filtered options. The hook should mirror that and just snapshot selectedOptions as‑is when isReady becomes true, which pins all pre-selected items at the top on first render — matching the expected behavior you described.

@MelvinBot ok then let's do this

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
Comment thread src/hooks/useFrozenPreSelection.ts Outdated
Comment on lines +39 to +52
// Walk sections in order to collect the latest live rows for frozen keys so toggles refresh in place.
const frozenData: TItem[] = [];
for (const section of sections) {
for (const item of section.data) {
if (item.keyForList && frozenKeys.has(item.keyForList)) {
frozenData.push(item);
}
}
}

const filteredSections = sections.map((section) => ({
...section,
data: section.data.filter((item) => !item.keyForList || !frozenKeys.has(item.keyForList)),
}));
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@MelvinBot we can avoid double loop through sections.

How about simplifying like this?

    const filteredSections = sections.map((section) => {
        const data = [];
        for (const item of section.data) {
            if (item.keyForList && frozenKeys.has(item.keyForList)) {
                frozenData.push(item);
            } else {
                data.push(item);
            }
        }
        return {...section, data};
    });

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Applied in bf634e9. Folded the collect-frozen pass into the section-filter .map so we only walk sections once instead of twice.

Tests:

  • jest tests/unit/hooks/useFrozenPreSelection.test.ts — 6/6 passed
  • jest tests/unit/SelectionListOrderUtilsTest.ts tests/unit/useSearchSelectorTest.tsx — 17/17 passed
  • prettier, eslint, react-compiler-compliance-check — clean

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Yes — that's a nicer shape than what I sketched, and keyForList is reliable: it's typed as a non-optional string on OptionsListUtils/types.ts:109 and is consistently populated by the option builders. Single pass + no separate isFrozen() predicate is a clear win, and it collapses the dedupe + extract steps that today live in SearchFiltersChatsSelector.tsx:130-158 and SearchFiltersParticipantsSelector.tsx:128-218 into one loop.

Two small things to be aware of so the behavior stays equivalent:

  1. Frozen-section ordering. Today the frozen rows render in the order of the captured selectedOptions snapshot (Chats L130, Participants L136-L145). The proposed loop would order them by their position in the input sections instead. Probably fine (arguably more consistent), but worth a quick sort against the snapshot if you want byte-for-byte parity.

  2. Frozen items missing from current sections. If a snapshot item drops out of Recents/Contacts (server-side search narrows the result, search term filters it, etc.), the proposed approach won't surface it because there's nothing to partition. Today's code keeps it visible by iterating the snapshot itself. In practice the "extra selected" section + the existing matchesSearchTerm filter on the frozen snapshot already make this near-equivalent — but the hook should probably still iterate the snapshot for any keys not hit during the section walk, just to preserve the "once frozen, stays pinned" guarantee.

Roughly:

const frozenData: T[] = [];
const seen = new Set<string>();
const filteredSections = sections.map((section) => {
    const data: T[] = [];
    for (const item of section.data) {
        if (item.keyForList && frozenKeys.has(item.keyForList)) {
            frozenData.push(item);
            seen.add(item.keyForList);
        } else {
            data.push(item);
        }
    }
    return {...section, data};
});
// Backfill snapshot items that weren't in any section
for (const item of frozenSnapshot) {
    if (item.keyForList && !seen.has(item.keyForList)) {
        frozenData.push(item);
    }
}

Happy to roll this into the follow-up PR shape — useFrozenPreSelection returns { frozenKeys, snapshot }, and applyFrozenSections(sections, frozen) does the single-pass partition above and prepends the frozen section. Caller still owns "extra selected" since the inclusion rules differ between Chats and Participants.

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  1. Frozen-section ordering. Today the frozen rows render in the order of the captured selectedOptions snapshot (Chats L130, Participants L136-L145). The proposed loop would order them by their position in the input sections instead. Probably fine (arguably more consistent), but worth a quick sort against the snapshot if you want byte-for-byte parity.

@MelvinBot It's fine

  1. Frozen items missing from current sections. If a snapshot item drops out of Recents/Contacts (server-side search narrows the result, search term filters it, etc.), the proposed approach won't surface it because there's nothing to partition. Today's code keeps it visible by iterating the snapshot itself. In practice the "extra selected" section + the existing matchesSearchTerm filter on the frozen snapshot already make this near-equivalent — but the hook should probably still iterate the snapshot for any keys not hit during the section walk, just to preserve the "once frozen, stays pinned" guarantee.

Roughly:

const frozenData: T[] = [];
const seen = new Set<string>();
const filteredSections = sections.map((section) => {
    const data: T[] = [];
    for (const item of section.data) {
        if (item.keyForList && frozenKeys.has(item.keyForList)) {
            frozenData.push(item);
            seen.add(item.keyForList);
        } else {
            data.push(item);
        }
    }
    return {...section, data};
});
// Backfill snapshot items that weren't in any section
for (const item of frozenSnapshot) {
    if (item.keyForList && !seen.has(item.keyForList)) {
        frozenData.push(item);
    }
}

Happy to roll this into the follow-up PR shape — useFrozenPreSelection returns { frozenKeys, snapshot }, and applyFrozenSections(sections, frozen) does the single-pass partition above and prepends the frozen section. Caller still owns "extra selected" since the inclusion rules differ between Chats and Participants.

@MelvinBot I don't see any case where pre-selected items don't exist in sections. Do you have any example case or page?
Anyway, if not exist in sections, not visible in UI too so it's also fine not adding to frozenData.

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Good point — you're right. With shouldKeepSelectedInAvailableOptions: true, any currently-selected item is guaranteed to be in chatOptions.recentReports / chatOptions.personalDetails, so the snapshot can't "drop out" for selected items.

The only edge case is a pre-selected item that the user deselects during the session AND that no longer matches the current search term. Today's code would still pin it (with isSelected: false); partition-only would drop it. But "pinned, deselected, unmatching" is questionable UX anyway — your way is arguably cleaner.

Dropping the snapshot backfill. The follow-up hook shape becomes:

  • useFrozenPreSelection({ selectedOptions, isReady, visibleCount, threshold, getKey, waitForHydration }) → { frozenKeys }
  • applyFrozenSections(sections, frozenKeys) → { frozenSection, filteredSections } — single-pass partition by keyForList in section order, no backfill.

Caller still owns the "extra selected" section since Chats vs. Participants differ on inclusion rules.

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
Comment thread src/hooks/useFrozenPreSelection.ts Outdated
*/
function useFrozenPreSelection<TItem extends ListItem>(sections: Array<Section<TItem>>, initialSelectedValues: string[], canCapture: boolean): Array<Section<TItem>> {
// null = not captured yet; empty Set = captured but list was too short to pin.
const [frozenKeys, setFrozenKeys] = useState<Set<string> | null>(null);
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@MelvinBot when pre-selected items are not in paginated list, they disappear when unselect.
To prevent this, let's store full items (<key, item>) instead of just keys.

Pseudocode:

    const [frozenData, setFrozenData] = useState(null);

    if (frozenData === null && canCapture) {
        const totalCount = sections.reduce((sum, section) => sum + section.data.length, 0);
        if (totalCount < CONST.STANDARD_LIST_ITEM_LIMIT) {
            setFrozenData(empty);
        } else {
            const captured;
            for (const section of sections) {
                for (const item of section.data) {
                    const key = item.keyForList;
                    if (key && initialSelectedValues.includes(key)) {
                        captured.add(<key, item>);
                    }
                }
            }
            setFrozenData(captured);
        }
    }

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@MelvinBot you didn't get what I mean.

Below is not complete code but get my idea from this:

    const [frozenData, setFrozenData] = useState<Map<string, TItem> | null>(null);

    if (frozenData === null && canCapture) {
        const totalCount = sections.reduce((sum, section) => sum + section.data.length, 0);
        if (totalCount < CONST.STANDARD_LIST_ITEM_LIMIT) {
            setFrozenData(new Map());
        } else {
            const captured = new Map();
            for (const section of sections) {
                for (const item of section.data) {
                    const key = item.keyForList;
                    if (key && initialSelectedValues.includes(key)) {
                        captured.set(key, item);
                    }
                }
            }
            setFrozenData(captured);
        }
    }

    if (!frozenData || frozenData.size === 0) {
        return sections;
    }

    const frozenSectionData = [...frozenData.values()].map((item) => ({...item, isSelected: false}));
    const filteredSections = sections.map((section) => {
        const data: TItem[] = [];
        for (const item of section.data) {
            if (item.keyForList || frozenData.has(item.keyForList)) {
                const frozenItem = frozenSectionData.find(({keyForList}) => keyForList === item.keyForList);
                if (frozenItem) {
                    frozenItem.isSelected = true;
                }
            } else {
                data.push(item);
            }
        }
        return {...section, data};
    });

    return [{data: frozenSectionData, sectionIndex: 0}, ...filteredSections];

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The "full items vs keys" framing may not match what's in this PR — the current code already stores OptionData[] (full items) captured from selectedOptions, which is enriched from Onyx (reports collection / personalDetails) regardless of pagination. See SearchFiltersChatsSelector.tsx:74-83 and the capture at L116 / participants L96-L104.

The disappear-on-unselect bug is real, but the cause is the threshold gate, not the storage shape. When Recents (chats) or Recents+Contacts (participants) is shorter than STANDARD_LIST_ITEM_LIMIT, frozen = [], so any pre-selected item not in the visible list lands in extraSelectedReports / extraSelectedOptions. Those sections are selectedOptions.filter(...) — toggle off and the row vanishes.

Your sections.reduce(...) proposal has the same gap: with totalCount < STANDARD_LIST_ITEM_LIMIT you'd still skip capture, and a short list with pre-selected items not in Recents would still drop them on unselect.

Suggested fix

Capture "would-be extras" into a persistent set regardless of the top-pin threshold, separate from the top-pinning behavior:

const [frozen, setFrozen] = useState<{topPin: T[]; persisted: T[]} | null>(null);
if (frozen === null && canCapture) {
    const visibleKeys = new Set(/* keys from recents (+ contacts) at first ready render */);
    const persisted = selectedOptions.filter((opt) => !visibleKeys.has(getKey(opt)));
    const topPin = totalVisible >= STANDARD_LIST_ITEM_LIMIT
        ? selectedOptions.filter((opt) => visibleKeys.has(getKey(opt)))
        : [];
    setFrozen({topPin, persisted});
}

Render topPin + persisted as the frozen section and drop the live extraSelectedReports / extraSelectedOptions filter — persisted covers it deterministically. This keeps the "don't pin for short lists" UX while fixing the disappear-on-unselect bug.

If you want O(1) lookups during render, a Map<string, T> is a fine representation choice — but that's orthogonal to the bug. The bug-relevant change is what gets captured and when, not whether it's an array vs a Map.

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Yes — that shape is cleaner than what I sketched. A sections-in/sections-out transform keyed off keyForList (which SelectionListWithSections already requires) drops the per-consumer getKey plumbing and lets the util own dedupe/threshold/pinning. Both PR files would reduce to roughly:

const sections = useFrozenPreSelection({sections: rawSections, initialSelectedValues, canCapture: areOptionsInitialized});

A few notes on the sketch before we lift it out:

Implementation notes

1. Condition typo (drops every keyed item from the rest of the list):

if (item.keyForList || frozenData.has(item.keyForList)) {  // ❌ short-circuits true for any keyed item

Should be && — otherwise every item with a keyForList (i.e. all of them) hits the frozen branch and gets dropped from its original section, leaving the Recents / Contacts sections empty.

2. isSelected source of truth. The sketch infers selection from "still appears somewhere in sections." That works for SearchFiltersChatsSelector (Recents stays stable) but not for SearchFiltersParticipantsSelector, where a frozen row might also be filtered out by the current search term while still being selected. Safer to either:

  • Mirror item.isSelected from the matching live-section item when present, falling back to the snapshot's flag; or
  • Take selectedKeys: Set<string> as a second parameter (what the consumer already has) and derive isSelected from that.

The second is more explicit and avoids the "matches by presence" coupling.

3. Perf — replace Array.find() inside the per-item loop:

const frozenItem = frozenSectionData.find(({keyForList}) => keyForList === item.keyForList);

With N frozen × M total this is O(N·M) per render. Either index frozenSectionData by keyForList into a Map once at the top, or build frozenSectionData in a single pass after the filter so each frozen item is touched once. Same final result, O(N+M).

4. Capture timing. The current participants selector waits one extra render — initialAccountIDs.length === 0 || selectedOptions.length > 0 — so it doesn't capture an empty snapshot before useEffect hydrates selectedOptions from initialAccountIDs. Either the caller folds that into canCapture, or the util takes a hasHydrated flag. I'd push it onto the caller — the util shouldn't know about hydration semantics.

5. What stays in the caller. Your sketch correctly leaves out the "extra selected" section (selected items not in any input section — name-only attendees, current user, server-search misses). That's consumer-specific logic and shouldn't move into the util; the util's job is just "pin frozen at the top, dedupe from the rest."

Want me to open a follow-up PR with useFrozenPreSelection + migrate both SearchFilters*Selector files? Happy to do it after this one lands so the diff here stays scoped.

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@MelvinBot review this again:

    const [frozenData, setFrozenData] = useState<Map<string, TItem> | null>(null);

    if (frozenData === null && canCapture) {
        const totalCount = sections.reduce((sum, section) => sum + section.data.length, 0);
        if (totalCount < CONST.STANDARD_LIST_ITEM_LIMIT) {
            setFrozenData(new Map());
        } else {
            const captured = new Map();
            for (const section of sections) {
                for (const item of section.data) {
                    const key = item.keyForList;
                    if (key && initialSelectedValues.includes(key)) {
                        captured.set(key, {...item, isSelected: false});
                    }
                }
            }
            setFrozenData(captured);
        }
    }

    if (!frozenData || frozenData.size === 0) {
        return sections;
    }

    const frozenSectionData = new Map(frozenData);
    const filteredSections = sections.map((section) => {
        const data: TItem[] = [];
        for (const item of section.data) {
            if (frozenSectionData.has(item.keyForList)) {
                frozenSectionData.set(item.keyForList, {...item, isSelected: item.isSelected});
            } else {
                data.push(item);
            }
        }
        return {...section, data};
    });

    return [{data: [...frozenSectionData.values()], sectionIndex: 0}, ...filteredSections];

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A few things to fix before this is ready, mostly around how the "frozen" state stays in sync once the user searches.

Stale isSelected for items not currently in sections. The hook only refreshes a frozen item's isSelected when it's still present in the incoming sections. Once the caller filters baseSections by search term (as SearchFiltersParticipantsSelector.tsx:110 does via matchesSearchTerm), any frozen item dropped from the input keeps the isSelected: false it was captured with — so a row the user has explicitly selected can render as unchecked. Take a currentSelectedKeys: Set<string> and derive isSelected from that for every frozen item, regardless of whether it appears in the current sections.

{...item, isSelected: item.isSelected} is a no-op. It's equivalent to {...item}. If the intent is "preserve the captured row's identity, just update its checkmark", it should be {...frozenData.get(key)!, isSelected: currentSelectedKeys.has(key)}. As written, the captured copy is silently discarded on every render in favor of the current sections' copy — which leaks the issue above and also means the original capture is doing no work beyond ordering.

initialSelectedValues.includes(key) is O(n·m). Convert to a Set once before the capture loop.

Smaller things
  • Empty frozenData shortcut works but masks a subtle case: if (!frozenData || frozenData.size === 0) return sections; — once frozenData is an empty Map (sub-threshold case), the hook returns sections unchanged forever. That's the intended "no pinning" behavior, but a comment makes the lock semantics clearer.
  • Search-time UX divergence from the original. Today's code in SearchFiltersParticipantsSelector.tsx:136-145 drops frozen rows that don't match the current search term. The hook always pins all frozen rows. Decide which behavior you want — pinning frozen rows that don't match the search may feel weird (a typed query returns "no results" but still shows the pinned section). If you keep "always pinned," ensure the isSelected fix above is in place.
  • sectionIndex: 0 collides with whatever index the first caller section already uses (participants' extraSelectedOptions is sectionIndex: 1, but if any caller starts at 0 you'll have duplicates). Either renumber the spread sections ({...section, sectionIndex: section.sectionIndex + 1}) or document that the frozen section always takes index 0 and callers should shift.
  • Allocations on every render. The outer sections.map(...) and new Map(frozenData) rebuild every time even when the search doesn't move anything in/out of the frozen set. With React Compiler this is mostly fine, but you could skip the work when frozenData.size === 0 (already done) and when no input item's keyForList is in the frozen set. Not worth optimizing unless you see it in a profile.
  • Capture-time isSelected: false is a smell. Since the hook will (per the fix above) recompute isSelected from current selection on every render, the captured isSelected value is irrelevant. Either omit it or capture true to reflect that these items were selected at capture time — both work, but false makes the intermediate Map state misleading when read in isolation.

If you'd like, I'm happy to sketch the corrected hook + a unit test that exercises the "search hides a frozen row" case — let me know.

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A few things to fix before this is ready, mostly around how the "frozen" state stays in sync once the user searches.

Stale isSelected for items not currently in sections. The hook only refreshes a frozen item's isSelected when it's still present in the incoming sections. Once the caller filters baseSections by search term (as SearchFiltersParticipantsSelector.tsx:110 does via matchesSearchTerm), any frozen item dropped from the input keeps the isSelected: false it was captured with — so a row the user has explicitly selected can render as unchecked. Take a currentSelectedKeys: Set<string> and derive isSelected from that for every frozen item, regardless of whether it appears in the current sections.

{...item, isSelected: item.isSelected} is a no-op. It's equivalent to {...item}. If the intent is "preserve the captured row's identity, just update its checkmark", it should be {...frozenData.get(key)!, isSelected: currentSelectedKeys.has(key)}. As written, the captured copy is silently discarded on every render in favor of the current sections' copy — which leaks the issue above and also means the original capture is doing no work beyond ordering.

initialSelectedValues.includes(key) is O(n·m). Convert to a Set once before the capture loop.

Smaller things

  • Empty frozenData shortcut works but masks a subtle case: if (!frozenData || frozenData.size === 0) return sections; — once frozenData is an empty Map (sub-threshold case), the hook returns sections unchanged forever. That's the intended "no pinning" behavior, but a comment makes the lock semantics clearer.
  • Search-time UX divergence from the original. Today's code in SearchFiltersParticipantsSelector.tsx:136-145 drops frozen rows that don't match the current search term. The hook always pins all frozen rows. Decide which behavior you want — pinning frozen rows that don't match the search may feel weird (a typed query returns "no results" but still shows the pinned section). If you keep "always pinned," ensure the isSelected fix above is in place.
  • sectionIndex: 0 collides with whatever index the first caller section already uses (participants' extraSelectedOptions is sectionIndex: 1, but if any caller starts at 0 you'll have duplicates). Either renumber the spread sections ({...section, sectionIndex: section.sectionIndex + 1}) or document that the frozen section always takes index 0 and callers should shift.
  • Allocations on every render. The outer sections.map(...) and new Map(frozenData) rebuild every time even when the search doesn't move anything in/out of the frozen set. With React Compiler this is mostly fine, but you could skip the work when frozenData.size === 0 (already done) and when no input item's keyForList is in the frozen set. Not worth optimizing unless you see it in a profile.
  • Capture-time isSelected: false is a smell. Since the hook will (per the fix above) recompute isSelected from current selection on every render, the captured isSelected value is irrelevant. Either omit it or capture true to reflect that these items were selected at capture time — both work, but false makes the intermediate Map state misleading when read in isolation.

If you'd like, I'm happy to sketch the corrected hook + a unit test that exercises the "search hides a frozen row" case — let me know.

@MelvinBot yes, sketch please

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Sketch below. First, a quick reconciliation against what's already on bf634e9:

  • 2 and 3 ("{...item, isSelected: item.isSelected} no-op" / "includes is O(n·m)") don't apply to the current hook. The current code pushes the live item (no spread) and uses new Set(initialSelectedValues) for capture lookup — see useFrozenPreSelection.ts:16-30. I'll skip those.
  • 1, 5 ("stale isSelected" / "search-time divergence") are actually two views of the same design choice. The current hook walks input sections each render to extract live rows, which means: (a) isSelected is always fresh; (b) if the caller filters out a row (e.g. by search), it disappears from the pinned section "for free." That's the current participant filter's UX. The redesign below decouples the two via an explicit predicate, so the caller picks the behavior.
  • 6 (sectionIndex: 0 collision) is real and worth fixing in the sketch — the current participant caller manually starts sections at 1, but that's an undocumented contract.
Sketch: useFrozenPreSelection (Map-based)
import {useMemo, useState} from 'react';
import type {ListItem} from '@components/SelectionList/ListItem/types';
import type {Section} from '@components/SelectionList/SelectionListWithSections/types';
import CONST from '@src/CONST';

type Options<TItem extends ListItem> = {
    /** True once source data is initialized and the snapshot can be evaluated. */
    canCapture: boolean;

    /** Pre-selected row identifiers, matched against `keyForList`. */
    initialSelectedValues: string[];

    /** Current selection. Pinned rows render with `isSelected` derived from this on every render. */
    currentSelectedKeys: Set<string>;

    /**
     * Optional predicate (e.g. matches-search-term). Captured rows that fail it are hidden this
     * render but stay in the snapshot, so removing the filter brings them back in the same order.
     */
    shouldRenderPinned?: (item: TItem) => boolean;
};

/**
 * Pins pre-selected rows to a new top section on the first ready render, then locks the order.
 * Pass `sectionIndex` starting from `1` in your input — `0` is reserved for the pinned section.
 */
function useFrozenPreSelection<TItem extends ListItem>(sections: Array<Section<TItem>>, options: Options<TItem>): Array<Section<TItem>> {
    const {canCapture, initialSelectedValues, currentSelectedKeys, shouldRenderPinned} = options;

    // null  → not captured yet
    // empty → captured, but the combined list was under the threshold — locked "no pinning"
    // map   → captured rows by keyForList, in traversal order
    const [frozen, setFrozen] = useState<Map<string, TItem> | null>(null);

    if (frozen === null && canCapture) {
        const totalCount = sections.reduce((sum, section) => sum + section.data.length, 0);
        if (totalCount < CONST.STANDARD_LIST_ITEM_LIMIT) {
            setFrozen(new Map());
        } else {
            const wanted = new Set(initialSelectedValues);
            const captured = new Map<string, TItem>();
            for (const section of sections) {
                for (const item of section.data) {
                    if (item.keyForList && wanted.has(item.keyForList) && !captured.has(item.keyForList)) {
                        // Strip stale capture-time `isSelected` — we recompute it from currentSelectedKeys on render.
                        const {isSelected, ...rest} = item;
                        captured.set(item.keyForList, rest as TItem);
                    }
                }
            }
            setFrozen(captured);
        }
    }

    return useMemo(() => {
        if (!frozen || frozen.size === 0) {
            return sections;
        }

        const pinned: TItem[] = [];
        for (const [key, item] of frozen) {
            if (shouldRenderPinned && !shouldRenderPinned(item)) {
                continue;
            }
            pinned.push({...item, isSelected: currentSelectedKeys.has(key)});
        }

        // Filter frozen keys out of input sections so rows don't double-render, and shift their
        // sectionIndex by +1 so the pinned section at index 0 doesn't collide.
        const filtered = sections.map((section) => ({
            ...section,
            sectionIndex: section.sectionIndex + 1,
            data: section.data.filter((item) => !item.keyForList || !frozen.has(item.keyForList)),
        }));

        if (pinned.length === 0) {
            return filtered;
        }
        return [{data: pinned, sectionIndex: 0} as Section<TItem>, ...filtered];
    }, [sections, frozen, currentSelectedKeys, shouldRenderPinned]);
}

export default useFrozenPreSelection;

Caller change (participants):

const currentSelectedKeys = useMemo(
    () => new Set(selectedOptions.map((o) => o.keyForList).filter((k): k is string => !!k)),
    [selectedOptions],
);

const sections = useFrozenPreSelection<OptionData>(baseSections, {
    canCapture: areOptionsInitialized && hasAttemptedHydration,
    initialSelectedValues: initialAccountIDs,
    currentSelectedKeys,
    // Match today's UX: pinned "A" disappears when user types "B".
    shouldRenderPinned: matchesSearchTerm,
});

Note the caller no longer needs to gate canCapture on empty search — capture still wins the race because frozen === null only on the first ready render, and on that render the search term is empty by definition (the field hasn't been interacted with yet).

Sketch: new test for "search hides a frozen row"
it('hides pinned rows that fail shouldRenderPinned without losing capture, and toggle restores them', () => {
    const a: Item = {keyForList: 'a'};
    const b: Item = {keyForList: 'b'};
    const sections = padTo(longList, [a, b]);

    const {result, rerender} = renderHook(
        ({shouldRender}: {shouldRender?: (item: Item) => boolean}) =>
            useFrozenPreSelection<Item>(sections, {
                canCapture: true,
                initialSelectedValues: ['a', 'b'],
                currentSelectedKeys: new Set(['a', 'b']),
                shouldRenderPinned: shouldRender,
            }),
        {initialProps: {shouldRender: undefined as ((item: Item) => boolean) | undefined}},
    );

    expect(result.current.at(0)?.data.map((i) => i.keyForList)).toEqual(['a', 'b']);

    // Simulate "user typed something that excludes 'a'".
    rerender({shouldRender: (i: Item) => i.keyForList !== 'a'});
    expect(result.current.at(0)?.data.map((i) => i.keyForList)).toEqual(['b']);

    // Clear the search — 'a' returns in its original capture position.
    rerender({shouldRender: undefined});
    expect(result.current.at(0)?.data.map((i) => i.keyForList)).toEqual(['a', 'b']);
});

it('refreshes isSelected from currentSelectedKeys on every render', () => {
    const a: Item = {keyForList: 'a', isSelected: true};
    const sections = padTo(longList, [a]);

    const {result, rerender} = renderHook(
        ({selected}: {selected: Set<string>}) =>
            useFrozenPreSelection<Item>(sections, {
                canCapture: true,
                initialSelectedValues: ['a'],
                currentSelectedKeys: selected,
            }),
        {initialProps: {selected: new Set(['a'])}},
    );

    expect(result.current.at(0)?.data[0].isSelected).toBe(true);

    rerender({selected: new Set<string>()});
    expect(result.current.at(0)?.data[0].isSelected).toBe(false);

    rerender({selected: new Set(['a'])});
    expect(result.current.at(0)?.data[0].isSelected).toBe(true);
});

Want me to push this as a commit on the branch? It would replace the existing hook, the two callers' integration sites, and the test file. Reply @MelvinBot apply the sketch.

@mkhutornyi
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mkhutornyi commented May 31, 2026

@MelvinBot I don't think currentSelectedKeys is needed.

Review again:

const {canCapture, initialSelectedValues, matchesSearchTerm} = options;
    const [frozenData, setFrozenData] = useState<Map<string, TItem> | null>(null);

    if (frozenData === null && canCapture) {
        const totalCount = sections.reduce((sum, section) => sum + section.data.length, 0);
        if (totalCount < CONST.STANDARD_LIST_ITEM_LIMIT) {
            setFrozenData(new Map());
        } else {
            const captured = new Map();
            for (const section of sections) {
                for (const item of section.data) {
                    const key = item.keyForList;
                    if (key && initialSelectedValues.includes(key)) {
                        captured.set(key, {...item, isSelected: false});
                    }
                }
            }
            setFrozenData(captured);
        }
    }

    if (!frozenData || frozenData.size === 0) {
        return sections;
    }

    const frozenSectionData = new Map(frozenData);
    const filteredSections = sections.map((section) => {
        const data: TItem[] = [];
        for (const item of section.data) {
            if (frozenSectionData.has(item.keyForList)) {
                frozenSectionData.set(item.keyForList, {...item, isSelected: item.isSelected});
            } else {
                data.push(item);
            }
        }
        return {...section, data};
    });

    for (const [key, value] of frozenSectionData) {
        if (!matchesSearchTerm(value)) {
            frozenSectionData.delete(key);
        }
    }

    if (frozenSectionData.size === 0) {
        return filteredSections;
    }

    return [{data: [...frozenSectionData.values()], sectionIndex: 0}, ...filteredSections];

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Agreed — currentSelectedKeys isn't needed. The in-section items already carry the live isSelected set by useSearchSelector (via shouldKeepSelectedInAvailableOptions: true), so during the merge pass you can read it straight off item and copy it into the frozen entry. Nothing else has to participate in the lookup.

The bigger behavioral shift in your sketch — storing snapshots (Map<string, TItem>) instead of just keys (Set<string>) — is what makes this actually equivalent to the original PR. The current useFrozenPreSelection.ts:27-38 collects frozen rows by walking sections, so once a row falls out of sections (e.g., the upstream hook prunes a deselected pinned row that no longer matches the search), it silently drops from the pinned section too. The Map version keeps the row available and lets matchesSearchTerm make the explicit visibility call — which is the "pin and lock" semantic the original SearchFiltersParticipantsSelector.tsx#L136-L152 (pre-extraction) had.

A few small things to clean up before landing it:

  • {...item, isSelected: item.isSelected} is just {...item} — the spread already carries the flag.
  • Initial capture writes isSelected: false, which is fine because the same render early-returns (frozenData is still null until React applies the setState), and the next render's merge pass overwrites with the live value for everything still in sections. Worth a one-line comment so a future reader doesn't try to "fix" it.
  • matchesSearchTerm now sits on the hook's surface, which adds a callback prop callers have to thread through. Worth deciding whether that's preferable to having the caller filter the returned top section themselves — the hook stays purer if it just returns the unfiltered frozen rows and lets the caller apply the search filter (same one-liner as today). Either is fine; the API surface is the tradeoff.
  • The current hook already has canCapture gated on trimmedSearchTerm === '' (SearchFiltersParticipantsSelector.tsx:149). With the snapshot-based version that gate becomes more important, not less — capture must happen with empty search so the snapshot reflects the unfiltered initial view. Keep that.

Performance-wise it's the same single O(N) sweep over sections plus an O(K) snapshot rebuild — React Compiler handles the surrounding memoization.

@mkhutornyi
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@MelvinBot implement below pseudocode:

(shouldRenderPinned is optional)

const {initialSelectedValues, canCapture, shouldRenderPinned} = options;

    // null = not captured yet; empty Set = captured but list was too short to pin.
    const [frozenData, setFrozenData] = useState<Map<string, TItem> | null>(null);

    if (frozenData === null && canCapture) {
        const totalCount = sections.reduce((sum, section) => sum + section.data.length, 0);
        if (totalCount < CONST.STANDARD_LIST_ITEM_LIMIT) {
            setFrozenData(new Map());
        } else {
            const captured = new Map();
            for (const section of sections) {
                for (const item of section.data) {
                    const key = item.keyForList;
                    if (key && initialSelectedValues.includes(key)) {
                        captured.set(key, {...item, isSelected: false});
                    }
                }
            }
            setFrozenData(captured);
        }
    }

    if (!frozenData || frozenData.size === 0) {
        return sections;
    }

    const frozenSectionData = new Map(shouldRenderPinned ? frozenData : undefined);
    const filteredSections = sections.map((section) => {
        const data: TItem[] = [];
        for (const item of section.data) {
            if (frozenData.has(item.keyForList)) {
                frozenSectionData.set(item.keyForList, {...item, isSelected: item.isSelected});
            } else {
                data.push(item);
            }
        }
        return {...section, data};
    });

    if (shouldRenderPinned) {
        for (const [key, value] of frozenSectionData) {
            if (!shouldRenderPinned(value)) {
                frozenSectionData.delete(key);
            }
        }
    }

    if (frozenSectionData.size === 0) {
        return filteredSections;
    }

    return [{data: [...frozenSectionData.values()], sectionIndex: 0}, ...filteredSections];

Do not pass shouldRenderPinned in SearchFiltersChatsSelector. As it loads full list (no lazy loading), no need additional filtering by search.
Pass shouldRenderPinned in SearchFiltersParticipantsSelector because it's lazy loaded.

Switch useFrozenPreSelection to an options object so callers can opt into a
snapshot-backed pinned section that survives row-level disappearance — needed for
lazy-loaded selectors where a pinned row may not be present in the current
sections (e.g. a search term hides it). The hook now stores a Map<key, item>
snapshot, refreshes pinned rows from current section data when they reappear,
and (when shouldRenderPinned is provided) filters pinned rows through that
predicate so the pinned section stays in sync with the active search term.

SearchFiltersChatsSelector keeps the existing behavior since it loads the full
list — no shouldRenderPinned needed. SearchFiltersParticipantsSelector passes
matchesSearchTerm so pinned rows respect the search term during lazy load, and
drops the empty-search-term gate on canCapture now that the hook handles it.

Co-authored-by: mkhutornyi <mkhutornyi@users.noreply.github.com>
@MelvinBot
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Implemented in 0ebd9c7.

  • useFrozenPreSelection.ts now takes the options object {initialSelectedValues, canCapture, shouldRenderPinned} and uses a Map<key, item> snapshot (so pinned rows survive when they disappear from the live sections).
  • SearchFiltersChatsSelector.tsx calls it without shouldRenderPinned per your guidance.
  • SearchFiltersParticipantsSelector.tsx passes shouldRenderPinned: matchesSearchTerm and drops the empty-search-term gate on canCapture, so the snapshot fires as soon as hydration completes and pinned rows now filter through the active search.

AI Tests

Test Result
prettier ✅ Passed
eslint (on changed files) ✅ Passed
typecheck-tsgo ✅ Passed (pre-existing errors in MapView/utils.ts, ConvertGpsPointsTo2DArray.ts, useClearSelectedDomainMembersOnMoveComplete.ts, TryNewDotUtilsTest.ts, unrelated to this PR)
react-compiler-compliance-check (3 changed files) ✅ Passed (COMPILED)
jest tests/unit/hooks/useFrozenPreSelection.test.ts ✅ Passed (6 tests)
jest tests/unit/useSearchSelectorTest.tsx ✅ Passed (15 tests)
jest tests/unit/hooks/useAdvancedSearchFilters.test.ts ✅ Passed (18 tests)

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