fix(edit-content): preserve pagination on row reorder in relationship field

[oidacra]

Summary

• Fixed drag-and-drop row reorder in paginated relationship fields resetting to page 1
• Root cause: onRowReorder called setData() which unconditionally resets pagination offset and currentPage to 0/1
• Added reorderData() store method that updates the data array without touching pagination state

Closes #35106

Changes

File	Change
core-web/.../store/relationship-field.store.ts	Added reorderData() method that patches data without resetting pagination
core-web/.../dot-relationship-field.component.ts	Changed onRowReorder to call reorderData() instead of setData()
core-web/.../store/relationship-field.store.spec.ts	Added tests for reorderData() preserving pagination on page 1 and page 2+
core-web/.../dot-edit-content-relationship-field.component.spec.ts	Updated reorder tests to verify reorderData() is called

Acceptance Criteria

• When the user drags and drops a row to reorder on any paginated page other than page 1, the table remains on the same page after the reorder completes (pagination offset and currentPage are preserved)
• When the user drags and drops a row to reorder on page 1 of a paginated relationship field, the table remains on page 1 (no regression from current behavior)
• After a successful reorder on a non-first page, the page indicator still displays the correct current page number
• After a successful reorder on a non-first page, the items displayed are still the correct items for that page
• Adding new items via the "Existing Content" or "New Content" dialogs still resets pagination to page 1 (existing setData behavior preserved)
• Deleting an item on the last page that causes the page to become empty still falls back to the previous valid page (existing deleteItem logic preserved)

Test Plan

• Create a Content Type with a Relationship field (Many-to-Many)
• Create an entry and add 13+ items to the relationship field (triggers 3 pages)
• Navigate to page 2 or 3
• Drag and drop to reorder items — verify you stay on the same page
• Navigate to page 1 and reorder — verify no regression
• Add new items via "Existing Content" dialog — verify pagination resets to page 1
• Delete items on the last page until the page becomes empty — verify fallback to previous page

Visual Changes

CleanShot.2026-04-10.at.12.28.35.mp4

This PR fixes: #35106

[claude]

Claude finished @oidacra's task in 3m 10s —— View job

---

Claude finished @oidacra's task in 1m 52s —— View job

---

I'll analyze this and get back to you.

[claude]

Rollback Safety Analysis complete. Label AI: Safe To Rollback has been applied. This PR is frontend-only (Angular/TypeScript store method addition + component + tests) with no DB, ES, REST API, or backend changes. No unsafe categories match.

[Copilot]

Pull request overview

Fixes relationship-field row drag-and-drop reordering so pagination state (offset/currentPage) is preserved instead of resetting back to page 1, aligning reorder behavior with the existing paginated data rendering approach.

Changes:

• Added a reorderData() store method to update the backing data array without resetting pagination.
• Updated onRowReorder to use reorderData() (instead of setData()), preserving the current page after a reorder.
• Added/updated unit tests around reorderData() and the reorder call site.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
core-web/libs/edit-content/src/lib/fields/dot-edit-content-relationship-field/store/relationship-field.store.ts	Adds reorderData() to patch data without touching pagination state.
core-web/libs/edit-content/src/lib/fields/dot-edit-content-relationship-field/components/dot-relationship-field/dot-relationship-field.component.ts	Switches reorder persistence from setData() to reorderData() in onRowReorder.
core-web/libs/edit-content/src/lib/fields/dot-edit-content-relationship-field/store/relationship-field.store.spec.ts	Adds unit coverage ensuring reorderData() preserves pagination state.
core-web/libs/edit-content/src/lib/fields/dot-edit-content-relationship-field/dot-edit-content-relationship-field.component.spec.ts	Updates reorder-related expectations to reference reorderData().