feat: show diff hunk scope labels

Show per-side Tree-sitter scope paths inline and as sticky continuation labels. Keep presentation rows out of source coordinates, selections, and edits. Verified: cargo test (949 passed), cargo build, and real PTY smoke covering split/unified, wrapping, both split axes, sticky scrolling, live rename and undo. Size exception: 549 implementation lines added plus deleted, excluding tests and docs. Keep syntax extraction and coordinate-safe rendering together as one working behavior.
2026-10-15 14:15:05 +02:00
parent 75dc31b66f
commit a43094dda3
5 changed files with 958 additions and 68 deletions
@@ -104,6 +104,8 @@ Each buffer has a frontend-owned parser/tree cache. Unchanged revision/path skip

 Diff highlighting lazily owns two instances of the same syntax cache, keyed by the accepted comparison request ID and selected file. Before detects language from the old path when renamed; After uses the new path. Scrolling, focus changes, and explorer toggling reuse parsed spans without copying/reparsing snapshots. A fresh comparison identity prevents stale Working-checkout colors even when labels and paths are unchanged. Closing the view releases snapshot caches. Syntax styles patch foreground/modifiers over diff backgrounds; historical panes never receive live-buffer semantic tokens.

+Scope context is a lazily built row index over the existing primary/injected syntax trees, invalidated by source or grammar changes and warmed by diff updates. Ordinary buffer highlighting does not build it. The frontend's visual-row projection inserts inline/sticky scope labels in wrapped and unwrapped diffs; source alignment and excerpt ranges contain no label rows. Coloring, native selection/caret overlays, and source navigation skip these presentation rows. Before/After labels use their independent trees rather than live-workspace symbol analysis.
+
 ## Clipboard providers

 macOS publishes `public.utf8-plain-text` through the native Pasteboard Manager, checking allocation and OS-status failures before reporting success. Publication is synchronous and avoids per-copy interpreter/process startup; native calls do not have a subprocess deadline. Reads retain fixed JXA/AppKit `NSPasteboardTypeString` access through `osascript`. Both paths preserve literal RTF/EPS text rather than treating it as rich clipboard data. Linux supports Wayland with `wl-paste`/`wl-copy`, or X11 with `xclip`, on PATH with the corresponding display environment. Other platforms report unsupported access. Subprocess-backed access has a two-second deadline and bounded output; failures terminate/reap the process group.