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This reverts commit 09b83b6 and replaces it with a working version.
Because of the order in which the autocmd hooks run, the attempted
method of adding unloading instructions for my custom ftplugin and
indent rules to the b:undo_ftplugin and b:undo_indent doesn't actually
work.
This is because the custom rules for both groups from ~/.vim are sourced
*first*, before their core versions, so the changes the custom rules
made to b:undo_ftplugin and b:undo_indent are simply clobbered by the
core version when it loads itself.
Therefore we need to arrange for two things:
1. A custom variable needs to be checked and executed when the filetype
changes to revert the changes for the custom ftplugin or indent
rules.
2. That execution needs to take place *first* when the filetype
changes.
I wrote two simple plugins with very similar code that are designed to
run as a user's custom ftplugin.vim and indent.vim implementations,
running before their brethren in the Vim core, and setting up an autocmd
hook to :execute b:undo_user_ftplugin and b:undo_user_indent plugin
respectively.
This seemed to work well, so I've implemented it. It involves adding a
shim to ~/.vim/indent.vim and ~/.vim/ftplugin.vim to "preload" the
plugin when the `filetype indent plugin on` call is made. I've added
that to the relevant Makefile targets.
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