vim: Import v9.1.1831

* runtime(doc): fix typo in :h credits section
* 9.1.1831: stray vseps in right-most 'winfixwidth' window
* 9.1.1830: MS-Windows: Dark mode titlebar is not configurable
* 9.1.1829: filetype: KerML and SysML files are not recognized
* 9.1.1828: local variables shadowed by import names
* 9.1.1827: completion: v9.1.1797 broke Ctrl-Y behaviour
* runtime(doc): Use the optional tail command-name spec at :help :sign
* 9.1.1826: Patch v9.1.1230 causes confusion about Ctrl-C behaviour

Author: github-actions[bot]

gitlog.txt

@@ -1 +1 @@
-* [runtime(doc): update if\_perl after v9.1.1822)](https://github.com/vim/vim/commit/a67f2699b2c31cfda74f297fca3c152e164c9949)\n* [9.1.1825](https://github.com/vim/vim/commit/c51d1cc578da32939ee458e98d78b180e1235b4b): completion: flicker when LSP server is slow\n* [runtime(doc): update credits section](https://github.com/vim/vim/commit/420923c0c5975c8b049495303bced70ebae50723)\n* [9.1.1824](https://github.com/vim/vim/commit/bcf44668f6c865c8e2fb6429183a14f806a4130c): tests: no test for displaying 'foldcolumn' with Unicode "foldinner"\n* [9.1.1823](https://github.com/vim/vim/commit/dd9ed46a39df8a8b08ef4b491fdf53bcbfdc0c2d): diff: w\_topline may be invalidated\n* [runtime(doc): Add explanation for Vim's IME](https://github.com/vim/vim/commit/ae3a8664b3c532e7f17de64b6a049235afe4e0d7)\n* [runtime(java): Make changes for JDK 25](https://github.com/vim/vim/commit/bfcf638c738af658c0d170ab8f4b0eb17163380e)\n* [runtime(help): Update syntax](https://github.com/vim/vim/commit/85fd7f8983dcee3de96aecb736d23bc0daaecad8)
+* [runtime(doc): fix typo in :h credits section](https://github.com/vim/vim/commit/adc729cd32671c6a3bc6cbb3f0a64a984d454f01)\n* [9.1.1831](https://github.com/vim/vim/commit/620c6556778a0df15be4fa33647fff1f6ab36255): stray vseps in right-most 'winfixwidth' window\n* [9.1.1830](https://github.com/vim/vim/commit/3b3cb04fa311b61e163a1d9556596455cba653a6): MS-Windows: Dark mode titlebar is not configurable\n* [9.1.1829](https://github.com/vim/vim/commit/b73ccf7ff0326ece9c942127c1965475ad71b78a): filetype: KerML and SysML files are not recognized\n* [9.1.1828](https://github.com/vim/vim/commit/68585877610ac46ac27a911165d0ecb4fe181a04): local variables shadowed by import names\n* [9.1.1827](https://github.com/vim/vim/commit/f3d0d089074c4517b26ea3d2253eaae36c6212eb): completion: v9.1.1797 broke Ctrl-Y behaviour\n* [runtime(doc): Use the optional tail command-name spec at :help :sign](https://github.com/vim/vim/commit/a76ea52a485ee92d74a7f2435f7a027aa6bc7497)\n* [9.1.1826](https://github.com/vim/vim/commit/da91b5135fdd8aa0da9e38b39fe1174dd3b878a1): Patch v9.1.1230 causes confusion about Ctrl-C behaviour