[vim/vim] Buffer modified within autocommand considered as non-changed (Issue #21427)

[Maxim Kim]

habamax created an issue (vim/vim#21427)

Steps to reproduce

1. vim --clean
2. :autocmd BufNewFile * call append(0, "test")
3. :e test
4. :q

Expected behaviour

E37: No write since last change error should prevent vim exit.

Instead vim exits, loosing changes added by autocmd.

:echo getbufinfo(bufnr()) shows changed: 0

source: https://groups.google.com/g/vim_use/c/FwZD4NkKNSw

Version of Vim

9.2.1162

Environment

debian13, bash

Logs and stack traces

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[Maxim Kim]

habamax left a comment (vim/vim#21427)

:h 'modified'

	This option is not set when a change is made to the buffer as the
	result of a BufNewFile, BufRead/BufReadPost, BufWritePost,
	FileAppendPost or VimLeave autocommand event.  See |gzip-example| for
	an explanation.
	When 'buftype' is "nowrite" or "nofile" this option may be set, but
	will be ignored.

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[Maxim Kim]

habamax left a comment (vim/vim#21427)

Although, the original issue was about Filetype event, probably help should be updated.

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