vim: Import v8.2.4946

* 8.2.4946: Vim9: some code not covered by tests
* 8.2.4945: inconsistent use of white space
* Update runtime files and translations
* 8.2.4944: text properties are wrong after "cc"
* 8.2.4943: changing 'switchbuf' may have no effect
* 8.2.4942: error when setting 'filetype' in help file again
* 8.2.4941: '[ and '] marks may be wrong after undo
* 8.2.4940: some code is never used

gitlog.txt

@@ -1 +1 @@
-* [8.2.4939](https://github.com/vim/vim/commit/9af2bc075169e14fd06ed967d28eac7206d21f36): matchfuzzypos() with "matchseq" does not have all positions\n* [8.2.4938](https://github.com/vim/vim/commit/a59f2dfd0cf9ee1a584d3de5b7c2d47648e79060): crash when matching buffer with invalid pattern
+* [8.2.4946](https://github.com/vim/vim/commit/7f8a3b11bfc02f24dfd877d0a81392d679008180): Vim9: some code not covered by tests\n* [8.2.4945](https://github.com/vim/vim/commit/9f1983de4e8293bae32fdab72a459b1b64bf767f): inconsistent use of white space\n* [Update runtime files and translations](https://github.com/vim/vim/commit/3f32a5f1601ab2b0eba0caad00d4c26fb86a02a2)\n* [8.2.4944](https://github.com/vim/vim/commit/d0b1a09f44654bb5e29b09de1311845200f17d90): text properties are wrong after "cc"\n* [8.2.4943](https://github.com/vim/vim/commit/39c46b43780ad00ea27a93d92aadd44753d4c3ea): changing 'switchbuf' may have no effect\n* [8.2.4942](https://github.com/vim/vim/commit/de216732d45caa87e6f08f4319aa71e805a89a0e): error when setting 'filetype' in help file again\n* [8.2.4941](https://github.com/vim/vim/commit/82444cefa3fef87624a078ea86a72af7ef4ef42e): '\[ and '\] marks may be wrong after undo\n* [8.2.4940](https://github.com/vim/vim/commit/d0132f4862342eebe6d8e7a9096adf956ba6588b): some code is never used