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l0ng-aiandClaude Opus 5
3fd523e1b9
Clicking a sidebar row's `+N −N` opens the working-tree diff overlay. On a big tree that could stall the window, and not everyone wants an in-app diff viewer in the first place. Two halves, matching the report. The setting: `sidebar_diff_preview` (Settings → Window & Tabs, on by default, persisted in `config.json`). Off, the branch and the counts stay exactly where they are and read exactly the same; they lose only the pointer cursor and the `toggle_diff_overlay` handler, so the press falls through to ordinary tab activation. Both come off one value — `diff_click_cwd` — so they cannot get out of step. The performance work. All five of the reporter's hypotheses held up against v26.7.6, and each fix is measured on a 300-file / 90 000-line / 4.5 MB diff (release, macOS arm64): 1. The full diff was buffered before parsing — `git_status::git` uses `Command::output()`. Now streamed line by line through the new `git_status::git_lines` into an incremental `DiffParser`: peak transient buffer 4 552 060 bytes → 50 bytes, at ~1.7× the parse CPU (3.97 ms → 6.76 ms) on the background thread, where it never touches a frame. 2. The snapshot was deep-cloned per holder inside `this.update`, i.e. on the UI thread. Now shared behind `Arc`: 2.41 ms → 11 ns per holder. 3. The element tree is not virtualized — confirmed, not cured. Rendering is not being redesigned here; instead the element count is bounded (see 4) and `MAX_RENDERED_FILES` caps the cards built at all, with a "… and N more" line for the tail. 4. Auto-collapse was per file, and counted only +/− while the rendered body also has context lines. Added `AUTO_COLLAPSE_TOTAL_LINES` over *retained* lines: sixty forty-line files, none individually large, went from 2400 side-by-side rows to zero, under a summary saying the diff is too large to render efficiently and pointing at expanding individual files or `git diff`. 5. The Changes panel probed independently and kept its own snapshot. Both now go through `spawn_shared_diff_probe`, which dedupes by cwd and installs one `Arc` into every watcher; opening the overlay while the panel already shows that repo now paints from the panel's snapshot instead of re-probing. Plus a repo-wide retention budget (`MAX_TOTAL_LINES`, `MAX_FILES_WITH_HUNKS`): 90 000 lines / 6.2 MiB of line text → 20 000 / 1.2 MiB. The `+N −N` totals deliberately escape every cap — they are compared against `--numstat` to detect staleness, so a capped total would disagree forever and re-probe in a loop. Small diffs are untouched: a forty-file, twelve-lines-each tree is not oversized and still opens expanded, asserted directly. Not verified: anything requiring the GUI. No frame timings, no visual check of the oversized banner or the settings row, and `AUTO_COLLAPSE_TOTAL_LINES` is a judgement call anchored on row count rather than a measured frame budget. Refs #239. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>