[vim/vim] `b:undo_ftplugin` cannot undo window-local options in every window showing a buffer (Issue #21243)
Barrett Ruth
barrettruth created an issue (vim/vim#21243)Steps to reproduce
Start Vim:
vim --clean
Then run:
:filetype plugin on :setglobal colorcolumn= :set filetype=fixture :setlocal colorcolumn=73 :let b:undo_ftplugin = 'setlocal colorcolumn<' :split :set filetype=text :windo echo win_getid() (empty(&l:colorcolumn) ? '<empty>' : &l:colorcolumn) :messages
Actual behaviour
The current window has an empty colorcolumn, but the other window still has colorcolumn=73:
1001 <empty>
1000 73
Expected behaviour
Both windows should stop showing the filetype-specific color column when their shared buffer changes filetype. Generally, :help undo_ftplugin says that "the effect of the previous filetype should be undone" - and this isn't really true.
Obviously, we know that a buffer-scoped undo hook cannot fully undo window-local effects when the buffer is displayed in multiple windows. Just wanted to canonicalize this issue here as I found it today.
Note that this is distinct from #17113.
Version of Vim
9.1.1752
Environment
macOS arm64 + nix
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