vim-patch:9.2.0371: filetype: ghostty config files are not recognized (#39267)

Problem:  filetype: ghostty config files are not recognized
Solution: Detect ghostty configuration files as ghostty filetype,
          include a simple ghostty filetype plugin (Bez Hermoso)

closes: vim/vim#20002

b30803b231

Co-authored-by: Bez Hermoso <bezalelhermoso@gmail.com>
Co-authored-by: Christian Brabandt <cb@256bit.org>

runtime/ftplugin/ghostty.vim

@@ -0,0 +1,10 @@
+" Vim filetype plugin file
+" Language: ghostty
+
+" Quit if a ftplugin file was already loaded
+if exists("b:did_ftplugin")
+  finish
+endif
+
+" Use the cfg plugin, it's similar enough.
+runtime! ftplugin/cfg.vim

runtime/lua/vim/filetype.lua

@@ -565,6 +565,7 @@ local extension = {
   gel = 'gel',
   gmi = 'gemtext',
   gemini = 'gemtext',
+  ghostty = 'ghostty',
   gift = 'gift',
   prettierignore = 'gitignore',
   gleam = 'gleam',
@@ -2487,6 +2488,8 @@ local pattern = {
     ['/mypy/config$'] = 'dosini',
     ['^${HOME}/%.config/notmuch/.*/config$'] = 'dosini',
     ['^${XDG_CONFIG_HOME}/notmuch/.*/config$'] = 'dosini',
+    ['/ghostty/config$'] = 'ghostty',
+    ['/com%.mitchellh%.ghostty/config$'] = 'ghostty',
     ['^${XDG_CONFIG_HOME}/git/config$'] = 'gitconfig',
     ['%.git/config%.worktree$'] = 'gitconfig',
     ['%.git/config$'] = 'gitconfig',
@@ -2743,6 +2746,7 @@ local pattern = {
     ['^[a-zA-Z].*Properties%.'] = starsetf(detect.foam),
     ['^[a-zA-Z].*Properties$'] = detect.foam,
     ['/tmp/lltmp'] = starsetf('gedcom'),
+    ['/ghostty/themes/'] = starsetf('ghostty'),
     ['^gkrellmrc_.$'] = 'gkrellmrc',
     ['^${GNUPGHOME}/options$'] = 'gpg',
     ['/boot/grub/menu%.lst$'] = 'grub',

test/old/testdir/test_filetype.vim

@@ -327,6 +327,9 @@ func s:GetFilenameChecks() abort
     \ 'gedcom': ['file.ged', 'lltxxxxx.txt', '/tmp/lltmp', '/tmp/lltmp-file', 'any/tmp/lltmp', 'any/tmp/lltmp-file'],
     \ 'gel': ['file.gel'],
     \ 'gemtext': ['file.gmi', 'file.gemini'],
+    \ 'ghostty': ['ghostty/config', 'ghostty/keymaps.ghostty', '/.config/ghostty/config', '/.config/ghostty/keymaps.ghostty',
+    \             '~/Library/Application Support/com.mitchellh.ghostty/config.ghostty', '~/Library/Application Support/com.mitchellh.ghostty/config',
+    \             '~/.config/ghostty/themes/Custom Theme', '/usr/share/ghostty/themes/Builtin Theme'],
     \ 'gift': ['file.gift'],
     \ 'gitattributes': ['file.git/info/attributes', '.gitattributes', '/.config/git/attributes', '/etc/gitattributes', '/usr/local/etc/gitattributes', 'some.git/info/attributes'] + s:WhenConfigHome('$XDG_CONFIG_HOME/git/attributes'),
     \ 'gitcommit': ['COMMIT_EDITMSG', 'MERGE_MSG', 'TAG_EDITMSG', 'NOTES_EDITMSG', 'EDIT_DESCRIPTION'],