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Fix: Selection mode infinite loop causing app freeze after splitting expense#87290

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Fix: Selection mode infinite loop causing app freeze after splitting expense#87290
MelvinBot wants to merge 1 commit intomainfrom
claude-fixSelectionModeInfiniteLoop

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Explanation of Change

There is an infinite loop between MoneyReportHeader (which calls turnOffMobileSelectionMode when visible transactions <= 1) and useHandleSelectionMode (which calls turnOnMobileSelectionMode when selectedItems.length > 0). This causes the app to freeze after splitting an expense on Android.

This PR moves the visible transaction count check from MoneyReportHeader into the useHandleSelectionMode hook, so the decision to turn off selection mode when no visible items remain is centralized and doesn't conflict with the hook's own logic. The hook now accepts a visibleItemCount parameter and turns off selection mode when visibleItemCount <= 0 before checking selectedItems.

Fixed Issues

$ #87220

Tests

  1. Open any workspace chat
  2. Create a manual expense
  3. Open the just created expense
  4. Tap on "More" > "Split" > "Save"
  5. Once redirected to report again, select one of the splits
  6. Verify the app does NOT freeze
  • Verify that no errors appear in the JS console

Offline tests

N/A - this is a selection mode UI fix unrelated to network state.

QA Steps

  1. Open any workspace chat on Android HybridApp
  2. Create a manual expense
  3. Open the just created expense
  4. Tap on "More" > "Split" > "Save"
  5. Once redirected to report again, select one of the splits
  6. Verify the app does NOT become unresponsive
  • Verify that no errors appear in the JS console

PR Author Checklist

  • I linked the correct issue in the ### Fixed Issues section above
  • I wrote clear testing steps that cover the changes made in this PR
    • I added steps for local testing in the Tests section
    • I added steps for the expected offline behavior in the Offline steps section
    • I added steps for Staging and/or Production testing in the QA steps section
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    • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
    • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
  • I included screenshots or videos for tests on all platforms
  • I ran the tests on all platforms & verified they passed on:
    • Android: Native
    • Android: mWeb Chrome
    • iOS: Native
    • iOS: mWeb Safari
    • MacOS: Chrome / Safari
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      • If any non-english text was added/modified, I used JaimeGPT to get English > Spanish translation. I then posted it in #expensify-open-source and it was approved by an internal Expensify engineer. Link to Slack message:
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Screenshots/Videos

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

…eak infinite loop

Move the logic that turns off selection mode when no visible transactions
remain from MoneyReportHeader into useHandleSelectionMode hook. This
prevents an infinite loop between MoneyReportHeader (turning selection mode
off) and useHandleSelectionMode (turning it back on).

Co-authored-by: Andrew Rosiclair <arosiclair@users.noreply.github.com>
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codecov Bot commented Apr 7, 2026

Codecov Report

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

Files with missing lines Coverage Δ
src/components/MoneyReportHeader.tsx 0.00% <ø> (ø)
src/components/SelectionListWithModal/index.tsx 90.90% <ø> (ø)
src/hooks/useHandleSelectionMode.ts 100.00% <100.00%> (ø)
...stReportView/MoneyRequestReportTransactionList.tsx 0.00% <0.00%> (ø)
... and 13 files with indirect coverage changes

@arosiclair arosiclair marked this pull request as ready for review April 8, 2026 14:05
@arosiclair arosiclair requested a review from a team as a code owner April 8, 2026 14:05
@melvin-bot melvin-bot Bot requested review from a team, flaviadefaria and parasharrajat and removed request for a team April 8, 2026 14:05
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melvin-bot Bot commented Apr 8, 2026

@parasharrajat Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

@melvin-bot melvin-bot Bot requested review from arosiclair and huult and removed request for a team April 8, 2026 14:05
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melvin-bot Bot commented Apr 8, 2026

@huult @arosiclair One of you needs to copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

@arosiclair arosiclair removed the request for review from huult April 8, 2026 14:07
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@parasharrajat see the issue for context on this as the original freezing issue will no longer be reproducible on main

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Comment on lines +31 to +33
if (visibleItemCount <= 0) {
turnOffMobileSelectionMode();
} else if (selectedItems.length > 0 && !isMobileSelectionModeEnabled) {
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P2 Badge Keep selection mode active when filter hides all rows

Do not unconditionally disable selection mode when visibleItemCount is zero, because in several SelectionListWithModal consumers (for example WorkspaceMembersPage), turning selection mode off immediately clears the selected IDs. With this new branch, selecting items and then applying a search/filter that temporarily returns no visible rows will drop the user's selection state; clearing the filter no longer restores it. This is a regression in multi-select flows where filtering is expected to be non-destructive.

Useful? React with 👍 / 👎.

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This sounds legit... I'll take a look later

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@chatgpt-codex-connector Can you suggest test steps for this issue?

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@codex Suggest the test steps for this issue.

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Do not unconditionally disable selection mode when visibleItemCount is zero, because in several SelectionListWithModal consumers (for example WorkspaceMembersPage), turning selection mode off immediately clears the selected IDs. With this new branch, selecting items and then applying a search/filter that temporarily returns no visible rows will drop the user's selection state; clearing the filter no longer restores it. This is a regression in multi-select flows where filtering is expected to be non-destructive.

@MelvinBot, review this bug and verify if it is a real concern. Is so, suggest the test steps to reproduce this.

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No new product considerations here, so unsubscribing and unassigning myself.

@flaviadefaria flaviadefaria removed their request for review April 10, 2026 11:38
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Yes, this is a real concern. The bug would affect WorkspaceMembersPage and 10+ other SelectionListWithModal consumers.

Causal chain:

  1. User selects items, then types a search that matches zero rows
  2. displayData.length becomes 0 → passed as visibleItemCount to useHandleSelectionMode
  3. New branch at useHandleSelectionMode.ts:31 unconditionally calls turnOffMobileSelectionMode()
  4. Consumer useEffect (e.g. WorkspaceMembersPage.tsx:558-564) clears selected IDs when selection mode turns off → selection permanently lost
  5. Clearing the search filter restores visible rows but selections are gone

This pattern (clear selections when isMobileSelectionModeEnabled becomes false) exists in WorkspaceCategoriesPage, WorkspacePerDiemPage, WorkspaceTagsPage, WorkspaceTaxesPage, PolicyDistanceRatesPage, ReportParticipantsPage, RoomMembersPage, and more.

Test steps to reproduce

  1. Open any workspace → Members page on a small screen (mobile or narrow browser)
  2. Long-press to select 2+ members (selection mode activates)
  3. Type a search string in the filter/search box that matches no members (e.g. zzzzz)
  4. Expected (before this PR): Selection mode stays active; clearing the search restores your selections
  5. Actual (with this PR): Selection mode is turned off immediately → selected members are cleared → clearing the search shows all members but none are selected

The same steps apply to any page using SelectionListWithModal with search/filter (Categories, Tags, Per Diem, Taxes, etc.).

Suggested fix

Guard the visibleItemCount <= 0 branch so it only turns off selection mode when there are also no selected items:

if (visibleItemCount <= 0 && selectedItems.length === 0) {
    turnOffMobileSelectionMode();
}

This preserves the original fix for the infinite loop (when items are truly gone and nothing is selected) while avoiding the regression when items are merely filtered out of view.

@parasharrajat
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Legit Bug above. I can reproduce this. @arosiclair

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Yes, I'll reopen the PR when it's ready

@arosiclair arosiclair marked this pull request as draft April 14, 2026 13:26
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