vim-patch:9.1.0303: filetype: some protocol buffer files not recognized (#28293)

Problem:  filetype: some protocol buffer files not recognized
Solution: Detect '*.textproto', '*.textpb', '*.txtpb' as pbtxt files
          (Bruno Belanyi)

See: https://protobuf.dev/reference/protobuf/textformat-spec/#text-format-files

closes: vim/vim#14463

e54a8e7c73

Co-authored-by: Bruno BELANYI <bruno@belanyi.fr>

runtime/lua/vim/filetype.lua

@@ -776,6 +776,9 @@ local extension = {
   pas = 'pascal',
   lpr = detect_line1('<%?xml', 'xml', 'pascal'),
   dpr = 'pascal',
+  txtpb = 'pbtxt',
+  textproto = 'pbtxt',
+  textpb = 'pbtxt',
   pbtxt = 'pbtxt',
   g = 'pccts',
   pcmk = 'pcmk',

test/old/testdir/test_filetype.vim

@@ -523,7 +523,7 @@ func s:GetFilenameChecks() abort
     \ 'papp': ['file.papp', 'file.pxml', 'file.pxsl'],
     \ 'pascal': ['file.pas', 'file.dpr', 'file.lpr'],
     \ 'passwd': ['any/etc/passwd', 'any/etc/passwd-', 'any/etc/passwd.edit', 'any/etc/shadow', 'any/etc/shadow-', 'any/etc/shadow.edit', 'any/var/backups/passwd.bak', 'any/var/backups/shadow.bak', '/etc/passwd', '/etc/passwd-', '/etc/passwd.edit', '/etc/shadow', '/etc/shadow-', '/etc/shadow.edit', '/var/backups/passwd.bak', '/var/backups/shadow.bak'],
-    \ 'pbtxt': ['file.pbtxt'],
+    \ 'pbtxt': ['file.txtpb', 'file.textproto', 'file.textpb', 'file.pbtxt'],
     \ 'pccts': ['file.g'],
     \ 'pcmk': ['file.pcmk'],
     \ 'pdf': ['file.pdf'],