fix(highlight): avoid stale vim syntax redraws #211

Merged

barrettruth merged 3 commits from fix/vim-syntax-flicker into main

2026-04-06 18:23:13 +00:00

barrettruth commented

2026-04-06 18:15:39 +00:00

Summary

cache vim fallback syntax spans so deferred renders can reuse warm syntax immediately instead of always waiting for a scratch-buffer pass
track per-buffer deferred syntax jobs and changedticks so stale scheduled syntax work is skipped after buffer changes or refreshes
add regression coverage for cached vim syntax reuse and stale deferred syntax cancellation

Test plan

nix develop -c busted spec/highlight_spec.lua
nix develop -c busted spec/decoration_provider_spec.lua
nix develop -c busted
nix develop -c stylua --check lua/diffs/highlight.lua lua/diffs/init.lua spec/highlight_spec.lua spec/decoration_provider_spec.lua

## Summary - cache vim fallback syntax spans so deferred renders can reuse warm syntax immediately instead of always waiting for a scratch-buffer pass - track per-buffer deferred syntax jobs and changedticks so stale scheduled syntax work is skipped after buffer changes or refreshes - add regression coverage for cached vim syntax reuse and stale deferred syntax cancellation #### Test plan - [x] nix develop -c busted spec/highlight_spec.lua - [x] nix develop -c busted spec/decoration_provider_spec.lua - [x] nix develop -c busted - [x] nix develop -c stylua --check lua/diffs/highlight.lua lua/diffs/init.lua spec/highlight_spec.lua spec/decoration_provider_spec.lua