feat(heex): borrow matchit support from html (#12717)

Commit: 
https://github.com/vim/vim/commit/8967f6c4b9e2071dea9a63dbbbb93f6b9119ae99
Author: Chris Vincent <[email protected]>
Date:   Wed Aug 9 09:49:44 2023 -0500

    feat(heex): borrow matchit support from html 
(https://github.com/vim/vim/issues/12717)
    
    * feat(heex): borrow matchit support from html
    
    Makes % support behave the same in heex as in html. For example, quickly 
moving the cursor between opening and closing tags.
    
    * Remove unnecessary line; define b:undo_ftplugin first
    
    * Remove b:html_set_match_words

diff --git a/runtime/ftplugin/heex.vim b/runtime/ftplugin/heex.vim
index 5274d59fb..f79c69d2a 100644
--- a/runtime/ftplugin/heex.vim
+++ b/runtime/ftplugin/heex.vim
@@ -14,3 +14,14 @@ setlocal comments=:<%!--
 setlocal commentstring=<%!--\ %s\ --%>
 
 let b:undo_ftplugin = 'set sw< sts< et< com< cms<'
+
+" HTML: thanks to Johannes Zellner and Benji Fisher.
+if exists("loaded_matchit") && !exists("b:match_words")
+  let b:match_ignorecase = 1
+  let b:match_words = '<!--:-->,' ..
+       \             '<:>,' ..
+       \             '<\@<=[ou]l\>[^>]*\%(>\|$\):<\@<=li\>:<\@<=/[ou]l>,' ..
+       \             '<\@<=dl\>[^>]*\%(>\|$\):<\@<=d[td]\>:<\@<=/dl>,' ..
+       \             '<\@<=\([^/!][^ \t>]*\)[^>]*\%(>\|$\):<\@<=/\1>'
+  let b:undo_ftplugin ..= " | unlet! b:match_ignorecase b:match_words"
+endif

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