f5a090baae
## Problem `get_repo_root()` shells out to `git rev-parse` on every call, causing 4-6 redundant subprocesses per `gdiff_file()` invocation. Three other minor issues: `highlight_vim_syntax()` leaks a scratch buffer if `nvim_buf_call` errors, `lib.ensure()` silently drops callbacks during download so hunks highlighted mid-download permanently miss intra-line highlights, and the debounce timer callback can operate on a deleted buffer. ## Solution Cache `get_repo_root()` results by parent directory — repo roots don't change within a session. Wrap `nvim_buf_call` and `nvim_buf_delete` in pcall so the scratch buffer is always cleaned up. Replace the early `callback(nil)` in `lib.ensure()` with a pending callback queue that fires once the download completes. Guard the debounce timer callback with `nvim_buf_is_valid`. |
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