Merge pull request swiftlang#35219 from ackyshake/main

Conform to existing conventions for Vim ftplugin

Author: CodaFi

utils/vim/ftplugin/swift.vim

@@ -6,8 +6,16 @@
 " See https://swift.org/LICENSE.txt for license information
 " See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
 
+" Only do this when not done yet for this buffer
+if exists("b:did_ftplugin")
+  finish
+endif
+
+let b:did_ftplugin = 1
+let b:undo_ftplugin = "setlocal comments< expandtab< tabstop< shiftwidth< smartindent<"
+
 setlocal comments=s1:/*,mb:*,ex:*/,:///,://
 setlocal expandtab
-setlocal ts=2
-setlocal sw=2
+setlocal tabstop=2
+setlocal shiftwidth=2
 setlocal smartindent