openFile: nested write + BufWriteCmd handler can overwrite Claude's file during the acwrite step (known gap)

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Geschätzter Aufwand
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Issue-Typ
Bug
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Tech-Stack
lua, neovim
Bereich
devtools

Rechercherichtung

Start with the openFile paragraph of Side Effects in lua/claudecode/tools/README.md, then read earlier threads #408, #413 and #420 for the attempts already ruled out. The hard part is design: find a way to block writes of only the one buffer during the acwrite step without affecting other writes or prompts. Done means a documented, tested approach that keeps the E676 and E142 behaviour the issue describes.

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Beschreibung

needs-triage

openFile can still write the user's unsaved text over the file Claude just changed, in one narrow case. This issue tracks it, because #413 and #420 only documented it.

When it happens. All three must hold:

  1. openFile runs its acwrite step for the buffer: the buffer was opened before its file existed, or 'eventignore' or 'eventignorewin' ignores FileChangedShell.
  2. A user autocommand with ++nested on BufEnter, BufWinEnter or BufLeave writes that buffer while openFile shows it.
  3. A user BufWriteCmd handler that matches the file (such as BufWriteCmd *) writes <afile>.

Without ++nested, or without a matching handler, the write fails with E676 and Claude's file stays. Before #408, Neovim stopped this write with E13.

What was tried.

  • Turning the global 'write' option off during the step (#413 first version) stopped the overwrite but made a common autocmd BufLeave * update autosave fail openFile with E142.
  • nowrite or nofile 'buftype' make 'modified' read as off, which loses unsaved text through other autocommands (#408 round 7).
  • readonly does not stop :w! and prompts with 'confirm'.
  • A BufWriteCmd guard of openFile's own runs after the user's BufWriteCmd *.

Where it is documented. lua/claudecode/tools/README.md, openFile paragraph of Side Effects.

A fix needs a way to block writes of this one buffer during the step without blocking or prompting other writes.


Generated with xum • Model: anthropic:claude-opus-5-5 • Thinking: high

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