perf: add pagination and debounce to text editor

[lassopicasso]

Description

Users experience problems working in text editor when they have a larger textfile, https://digdir.slack.com/archives/C09BLD1CRK8/p1787231379057949.
Even when it is 100 rows (texts) it is pretty laggy to work in text editor such as using search, sort or add/remove languages.

To solve this I added a debounce on the search field in a previous PR, #20094.
That solved some of the problem, but it keeps freezing when rendering the full list when search is cleared.

But with debounce and pagination together it solved the problem. We don't render the full textfile, but 25 rows for each pagination.
I experience this to be much more user friendly. I have understood we are going to do a revamp of text editor4, so i have kept it simpel.

Below I have tested with a app that contains 100 ish texts.

Video before fix

textEditorProblem.mp4

Video after fix

texteditorFixed.mp4

Verification

• Related issues are connected (if applicable)
• Your code builds clean without any errors or warnings
• Manual testing done (required)
• Relevant automated test added (if you find this hard, leave it and we'll help out)

Summary by CodeRabbit

• New Features
  • Added pagination to text lists, displaying up to 25 rows per page with navigation controls when needed.
  • Added text filtering across keys and translations.
  • Added debounced search, applying queries after a short delay while clearing search results immediately.
  • Search input now stays synchronised when its value is changed externally.
• Bug Fixes
  • Clearing the search no longer allows a previously pending query to be applied.

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Reviewing files that changed from the base of the PR and between 548f1cd and 15cb09f.

📒 Files selected for processing (1)

• src/Designer/frontend/packages/text-editor/src/TextList.test.tsx

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📝 Walkthrough

Walkthrough

The text editor now debounces search updates, synchronises local input state, filters rows through a shared utility, and paginates filtered results with StudioPagination.

Changes

Text editor navigation

Layer / File(s)	Summary
Debounced search behaviour src/Designer/frontend/packages/text-editor/src/constants.ts, src/Designer/frontend/packages/text-editor/src/TextEditor.tsx, src/Designer/frontend/packages/text-editor/src/TextEditor.test.tsx	TextEditor keeps a local search value. Non-empty queries use a 300 ms debounce. Empty queries update immediately. Tests cover timer behaviour and external query updates.
Filtered row pagination src/Designer/frontend/packages/text-editor/src/utils.ts, src/Designer/frontend/packages/text-editor/src/hooks/usePaginatedRows.ts, src/Designer/frontend/packages/text-editor/src/TextList.tsx, src/Designer/frontend/libs/studio-components/src/components/StudioTableRemotePagination/index.ts, src/Designer/frontend/packages/text-editor/src/utils.test.ts, src/Designer/frontend/packages/text-editor/src/hooks/usePaginatedRows.test.ts, src/Designer/frontend/packages/text-editor/src/TextList.test.tsx	TextList filters rows, limits results to 25 rows per page, and renders StudioPagination when multiple pages exist. Tests cover filtering, page navigation, reset behaviour, and page bounds.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Merge Risk: ⚪ Minimal · up to 15cb0

The change localizes text-editor rendering and search work through pagination and debounce; no actionable merge-blocking risk remains, so it is merge-ready after normal checks.

Sequence Diagram(s)

sequenceDiagram
  participant User
  participant TextEditor
  participant TextList
  participant filterRows
  participant usePaginatedRows
  participant StudioPagination
  User->>TextEditor: enter search text
  TextEditor->>TextList: apply searchQuery after debounce
  TextList->>filterRows: filter resourceRows
  filterRows-->>TextList: return matching rows
  TextList->>usePaginatedRows: paginate matching rows
  usePaginatedRows-->>TextList: return rowsOnPage and pageCount
  TextList->>StudioPagination: render page controls when pageCount > 1

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🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly summarises the main changes: pagination and debounced search in the text editor.
Description check	✅ Passed	The description explains the problem and solution, and includes all required verification sections with completed checks.

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• Commit unit tests in branch perf/text-editor-pagination

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Actionable comments posted: 1

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Inline comments:
In `@src/Designer/frontend/packages/text-editor/src/TextList.test.tsx`:
- Around line 157-178: Update the TextList test setup by extending the existing
renderTextList helper to accept the generated resourceRows fixture and pass it
through to TextList. Remove the duplicate renderManyRows component-rendering
logic and use renderTextList in the pagination tests, preserving their existing
test data and behavior.

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ℹ️ Review info

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Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between 9a3af98 and 548f1cd.

📒 Files selected for processing (10)

• src/Designer/frontend/libs/studio-components/src/components/StudioTableRemotePagination/index.ts
• src/Designer/frontend/packages/text-editor/src/TextEditor.test.tsx
• src/Designer/frontend/packages/text-editor/src/TextEditor.tsx
• src/Designer/frontend/packages/text-editor/src/TextList.test.tsx
• src/Designer/frontend/packages/text-editor/src/TextList.tsx
• src/Designer/frontend/packages/text-editor/src/constants.ts
• src/Designer/frontend/packages/text-editor/src/hooks/usePaginatedRows.test.ts
• src/Designer/frontend/packages/text-editor/src/hooks/usePaginatedRows.ts
• src/Designer/frontend/packages/text-editor/src/utils.test.ts
• src/Designer/frontend/packages/text-editor/src/utils.ts

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.94%. Comparing base (070c7ab) to head (941f18f).
⚠️ Report is 761 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20117      +/-   ##
==========================================
+ Coverage   95.84%   95.94%   +0.10%     
==========================================
  Files        3028     3059      +31     
  Lines       39819    39999     +180     
  Branches     4910     4950      +40     
==========================================
+ Hits        38166    38379     +213     
+ Misses       1235     1196      -39     
- Partials      418      424       +6     

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[JamalAlabdullah]

Looks very nice and works well 🚀