Completion Category Mouse Selection

Scope

Verify that the tabbed @ completion picker can switch to an exact category with a mouse click when terminal mouse tracking is enabled. Keyboard category navigation and suggestion-row mouse behavior must remain unchanged.

Baseline

A released global qwen executable was not available in this environment, so the before-change Warp dry-run could not be repeated locally. The issue's SGR mouse reproduction reports that suggestion rows accept clicks while category labels do not. Source inspection on upstream/main confirms that suggestion rows have a mouse controller, while category labels have no refs or click handler.

Manual Scenario

1. Run Qwen Code in Warp with ui.mouseTracking enabled and the terminal buffer enabled.
2. Open a workspace where @ completion shows at least three tabs, such as All / Files / Sessions.
3. Click Files, then Sessions, then All.
4. Confirm that each click activates the exact tab under the pointer, resets the highlighted suggestion to the first visible result, and filters the suggestion rows for that category.
5. Confirm that clicking outside every tab does not change the active tab.
6. While the tab bar is visible, confirm that bare Left / Right cycles the categories. Press Esc to dismiss the picker and confirm the arrows return to normal input-caret behavior.
7. Set ui.mouseTracking to false, restart Qwen Code, and confirm that tab clicks are not intercepted by Qwen Code.

Regression Checks

• Only a left-button press activates a category; pointer movement and button release do not.
• The category hit area follows the rendered tab bounds in both normal and overflow layouts.
• Suggestion-row hover and click handling still use their existing controller.
• Export completion, command search, and reverse search do not receive a category-selection callback.

Automated Verification

cd packages/cli
npx vitest run \
  src/ui/components/CompletionCategoryMouseController.test.tsx \
  src/ui/components/SuggestionsDisplay.mouse.test.tsx \
  src/ui/components/InputPrompt.suggestionMouse.test.tsx \
  src/ui/hooks/useCompletion.test.ts

cd ../..
npm run lint
npm run build
npm run typecheck

Results

• The focused mouse/category regression suite passes: 4 files, 41 tests.
• Repository lint, build, and typecheck pass.
• Manual Warp execution remains for reviewer verification because Warp and a released global qwen executable were not available in this environment.