vim: Import v9.1.1512

* tests: fix typo in comment (after v9.1.1511)
* runtime(vim): Update base-syntax, match :filetype in functions
* 9.1.1512: completion: can only complete from keyword characters
* 9.1.1511: tests: two edit tests change v:testing from 1 to 0
* 9.1.1510: Search completion may use invalid memory
* 9.1.1509: patch 9.1.1505 was not good
* runtime(vim): Update base-syntax, match escape sequences in :command blocks
* runtime(go): fix `b:undo_ftplugin`

Author: github-actions[bot]

gitlog.txt

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-* [9.1.1508](https://github.com/vim/vim/commit/a494ce1c64a2637719a5c1339abf19ec7c48089c): string manipulation can be improved in cmdexpand.c\n* [runtime(vim): Update base-syntax and generator, match all default highlight groups](https://github.com/vim/vim/commit/c233c2e6a54778e034d62473e48421f25b2f5069)\n* [runtime(vim): Update base-syntax and generator, generate command modifiers](https://github.com/vim/vim/commit/a9b5e4af43ef1f03f20ebcf980f4dd555a12694d)\n* [9.1.1507](https://github.com/vim/vim/commit/4ade668fb62ebf3f8be537fe451caed6bd1eba9a): symlinks are resolved on :cd commands\n* [runtime(postscr): Correct some standard font names in syntax](https://github.com/vim/vim/commit/0d50d6089d42fa24f3aa423124752be452a4a769)\n* [runtime(optwin): show 'guiligatures' option also on MS-Windows builds](https://github.com/vim/vim/commit/29ebebd3437a501e5ed768a1f2773e267e248963)\n* [9.1.1506](https://github.com/vim/vim/commit/29b29c6b303c891fa32ac14b0317fa4a342e0418): tests: missing cleanup in Test\_search\_cmdline\_incsearch\_highlight()\n* [9.1.1505](https://github.com/vim/vim/commit/5d2354fc07b642f8835bef27e6dd46ee705726b5): not possible to return completion type for :ex command
+* [tests: fix typo in comment (after v9.1.1511)](https://github.com/vim/vim/commit/7a734b714895df25ba7ca9996fe0cd36460923a3)\n* [runtime(vim): Update base-syntax, match :filetype in functions](https://github.com/vim/vim/commit/5911ac5023594a55a3654c9050d4924ca3218d22)\n* [9.1.1512](https://github.com/vim/vim/commit/ba11e78f1d5342786faed0ebd5b09ffee7f7ff86): completion: can only complete from keyword characters\n* [9.1.1511](https://github.com/vim/vim/commit/96076bf41e0163cd61ca738b352896d450ee3636): tests: two edit tests change v:testing from 1 to 0\n* [9.1.1510](https://github.com/vim/vim/commit/5e34eec6f83222b1aa55c19d5f8f657d76d39121): Search completion may use invalid memory\n* [9.1.1509](https://github.com/vim/vim/commit/96b3ef23896ce70b2fdf3425ba2c013ce2840db6): patch 9.1.1505 was not good\n* [runtime(vim): Update base-syntax, match escape sequences in :command blocks](https://github.com/vim/vim/commit/a8b86605f39f168178dfbdc1971df4e19c636310)\n* [runtime(go): fix \`b:undo\_ftplugin\`](https://github.com/vim/vim/commit/f9d87fa6ba4b8026d089bf0fb755f6b0f7296408)