vim-patch:8.2.4729: HEEx and Surface templates do not need a separate filetype (#18065)

Problem:    HEEx and Surface templates do not need a separate filetype.
Solution:   Use Eelixir for the similar filetypes. (Aaron Tinio, closes vim/vim#10124)
fa76a24109

runtime/filetype.vim

@@ -412,9 +412,9 @@ au BufNewFile,BufRead *Eterm/*.cfg		setf eterm
 " Elixir or Euphoria
 au BufNewFile,BufRead *.ex call dist#ft#ExCheck()
 
-" Elixir
+" Elixir, also used for HEEx and Surface
 au BufRead,BufNewFile mix.lock,*.exs setf elixir
-au BufRead,BufNewFile *.eex,*.leex setf eelixir
+au BufRead,BufNewFile *.eex,*.heex,*.leex,*.sface setf eelixir
 
 " Elvish
 au BufRead,BufNewFile *.elv setf elvish
@@ -793,9 +793,6 @@ au BufRead,BufNewFile *.hcl			setf hcl
 " Hercules
 au BufNewFile,BufRead *.vc,*.ev,*.sum,*.errsum	setf hercules
 
-" HEEx
-au BufRead,BufNewFile *.heex			setf heex
-
 " HEX (Intel)
 au BufNewFile,BufRead *.hex,*.h32		setf hex
 
@@ -1901,9 +1898,6 @@ au BufNewFile,BufRead */etc/sudoers,sudoers.tmp	setf sudoers
 " SVG (Scalable Vector Graphics)
 au BufNewFile,BufRead *.svg			setf svg
 
-" Surface
-au BufRead,BufNewFile *.sface			setf surface
-
 " Tads (or Nroff or Perl test file)
 au BufNewFile,BufRead *.t
 	\ if !dist#ft#FTnroff() && !dist#ft#FTperl() | setf tads | endif

runtime/lua/vim/filetype.lua

@@ -173,7 +173,9 @@ local extension = {
   lid = "dylanlid",
   ecd = "ecd",
   eex = "eelixir",
+  heex = "eelixir",
   leex = "eelixir",
+  sface = "eelixir",
   exs = "elixir",
   elm = "elm",
   elv = "elvish",
@@ -267,7 +269,6 @@ local extension = {
   ev = "hercules",
   vc = "hercules",
   hcl = "hcl",
-  heex = "heex",
   hex = "hex",
   ["h32"] = "hex",
   hjson = "hjson",
@@ -644,7 +645,6 @@ local extension = {
   mata = "stata",
   ado = "stata",
   stp = "stp",
-  sface = "surface",
   svelte = "svelte",
   svg = "svg",
   swift = "swift",

src/nvim/testdir/test_filetype.vim

@@ -166,7 +166,7 @@ let s:filename_checks = {
     \ 'edif': ['file.edf', 'file.edif', 'file.edo'],
     \ 'elinks': ['elinks.conf'],
     \ 'elixir': ['file.ex', 'file.exs', 'mix.lock'],
-    \ 'eelixir': ['file.eex', 'file.leex'],
+    \ 'eelixir': ['file.eex', 'file.heex', 'file.leex', 'file.sface'],
     \ 'elm': ['file.elm'],
     \ 'elmfilt': ['filter-rules'],
     \ 'elvish': ['file.elv'],
@@ -237,7 +237,6 @@ let s:filename_checks = {
     \ 'hb': ['file.hb'],
     \ 'hcl': ['file.hcl'],
     \ 'hercules': ['file.vc', 'file.ev', 'file.sum', 'file.errsum'],
-    \ 'heex': ['file.heex'],
     \ 'hex': ['file.hex', 'file.h32'],
     \ 'hgcommit': ['hg-editor-file.txt'],
     \ 'hjson': ['file.hjson'],
@@ -516,7 +515,6 @@ let s:filename_checks = {
     \ 'stata': ['file.ado', 'file.do', 'file.imata', 'file.mata'],
     \ 'stp': ['file.stp'],
     \ 'sudoers': ['any/etc/sudoers', 'sudoers.tmp', '/etc/sudoers', 'any/etc/sudoers.d/file'],
-    \ 'surface': ['file.sface'],
     \ 'svg': ['file.svg'],
     \ 'svn': ['svn-commitfile.tmp', 'svn-commit-file.tmp', 'svn-commit.tmp'],
     \ 'swift': ['file.swift'],