Cache Explorer: agent filter, per-chunk breakdown, stable rail selection#320469
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Pull request overview
This PR enhances the Chat “Cache Explorer” (Agent Debug Logs) UI to make multi-agent sessions easier to understand and navigate, and to surface more detailed prompt-signature allocation information.
Changes:
- Adds an agent filter dropdown to the left rail to focus turns by agent (defaulting to
panel/editAgentwhen present). - Adds a collapsible per-chunk signature breakdown table (previous vs current chars and % of current).
- Makes rail selection stable (in-place selection updates + Up/Down navigation) to prevent focus loss and scroll jumps.
Show a summary per file
| File | Description |
|---|---|
| src/vs/workbench/contrib/chat/test/browser/chatDebugCacheExplorerView.test.ts | Adds unit tests for new helper logic (agent selection + chunk alignment). |
| src/vs/workbench/contrib/chat/browser/chatDebug/media/chatDebug.css | Styles for the rail toolbar filter UI and the chunk breakdown table. |
| src/vs/workbench/contrib/chat/browser/chatDebug/chatDebugCacheExplorerView.ts | Implements agent filtering, chunk breakdown rendering, and in-place rail selection updates. |
Copilot's findings
- Files reviewed: 3/3 changed files
- Comments generated: 1
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- Agent filter dropdown in the rail (defaults to panel/editAgent) - Collapsible per-chunk breakdown table for the prompt signature - Clicking/arrowing rail turns updates selection in place instead of rebuilding the rail, fixing focus loss and scroll jump; adds Up/Down nav
Agent-filter selection was stored as the turn's optional id, so turns without an id skipped the restore path and could still jump to an unrelated turn. Store the turn object instead and match in two passes: precise id/reference identity first, then a composite fallback for id-less turns so an earlier look-alike can't win over the exact turn.
- Rail rows use role=button, so swap aria-selected -> aria-current (kept in sync in selectTurn and on initial render). - Agent filter trigger: aria-haspopup=menu instead of generic true. - Mark decorative chevrons (filter + chunk-breakdown toggle) and the chunk role swatch aria-hidden. - Chunk breakdown gets table semantics: role table/row/columnheader/cell on header, data, and totals rows. - moveSelection: drop the per-keypress sort; railRowsByIndex Map iteration already yields rows in visual order.
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Three improvements to the Cache Explorer (Agent Debug Logs):
panel/editAgent, other agents toggleable.Fixes #320137.