[vim/vim] :startinsert enters Insert mode in a non-modifiable buffer (Issue #20804)

[Barrett Ruth]

barrettruth created an issue (vim/vim#20804)

:startinsert enters insert mode in a non-modifiable buffer

steps to reproduce

1. run vim --clean.
2. run :set nomodifiable.
3. run :startinsert.
4. type a character. vim is in insert mode but reports e21 because the buffer cannot be modified.

expected behaviour

:startinsert should report e21 without entering insert mode, consistent with pressing i.

version of vim

9.2.0541

environment

linux 6.18.39, ghostty 1.3.1, term=xterm-256color, zsh.

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