fix: garbled gutter symbols on collapsed inline diff hunk #686
Description
Summary
Line 37 in gutter shows garbled symbols (arrows/brackets) instead of a clean line number when an inline diff hunk is collapsed. Appears to be remnants of expand/collapse indicator or Accept/Revert buttons rendering incorrectly.
Screenshot
Line 37 shows ⟨37⟩ with decorative symbols instead of a plain line number.
Context
Seen after PR #685 (remove phantom overlay for modified lines). The modified hunk no longer shows overlay text, but the gutter decoration for the collapsed hunk renders garbage.
Implementation ideas
- Check what draws in the gutter area for collapsed modified hunks
- Ensure gutter only shows the fold/expand arrow, not button fragments