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

[Christian Brabandt]

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

Commit: https://github.com/vim/vim/commit/8967f6c4b9e2071dea9a63dbbbb93f6b9119ae99
Author: Chris Vincent <chris....@hey.com>
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