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I know you can run a command upon entering a filetype with...

au! Filetype foo echo "bar"

but what can I use to run this command when I leave this filetype?

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There's no such event as "leaving" FileType. It's just an option that could be set to another value effectively triggering yet another FileType event.

For user convenience, standard runtime supports buffer-locals b:undo_ftplugin and b:undo_indent to :execute them before new ftplugin/indent setting applied (provided that such variables exist). So they are used to undo anything done by the previous ftplugin/indent module.

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