vim: Import v9.1.1815

* runtime(help): Update syntax, match legacy header at :help vim9-mix
* 9.1.1815: file mode changes in os_amiga.pro
* 9.1.1814: Patch v9.1.1812 causes crashes
* 9.1.1813: MS-Windows: title bar is always white
* 9.1.1812: completion: flicker with slow LSPs
* runtime(doc): Update os-support section for Amiga OS
* 9.1.1811: Amiga: Initialization of random buffer can be improved
* 9.1.1810: completion: "longest" doesn't work for manual completion with 'ac'
* 9.1.1809: winclip.pro included in PRO_AUTO
* runtime(doc): Tweak documentation style
* nsis: Load correct readme at the end, refactor gvim.nsi slightly
* nsis: Reorder code blocks
* nsis: Split gvim.nsi and factor out auxiliary code into auxiliary.nsh
* nsis: Fix indentation and alignment issues in gvim.nsi
* runtime(tex): add amsmath support to tex syntax script
* 9.1.1808: Option insecure flags not copied when splitting window
* 9.1.1807: :set doesn't clear local insecure flag like :setlocal does
* runtime(doc): update list of modifiers at :h expand()

Author: github-actions[bot]

gitlog.txt

@@ -1 +1 @@
-* [9.1.1813](https://github.com/vim/vim/commit/dddde9ce123c665e27faccbcb368ca9e88ed18ed): MS-Windows: title bar is always white\n* [9.1.1812](https://github.com/vim/vim/commit/71b97f29054135151d618433a11ce611ba25844d): completion: flicker with slow LSPs\n* [runtime(doc): Update os-support section for Amiga OS](https://github.com/vim/vim/commit/8f214168bdf2948eb356a048596e70dd1114ee74)\n* [9.1.1811](https://github.com/vim/vim/commit/decc9dd6a2f9434326ee17b9d0b8089ebb227635): Amiga: Initialization of random buffer can be improved\n* [9.1.1810](https://github.com/vim/vim/commit/b3966d6a8e96c9de45a344ec3d42fbb156863835): completion: "longest" doesn't work for manual completion with 'ac'\n* [9.1.1809](https://github.com/vim/vim/commit/c6802f41da83d187f84b90e8b080112af4fbe91a): winclip.pro included in PRO\_AUTO\n* [runtime(doc): Tweak documentation style](https://github.com/vim/vim/commit/3b1901eb53ee02bd8701094f4fd6ad1bebe460e5)\n* [nsis: Load correct readme at the end, refactor gvim.nsi slightly](https://github.com/vim/vim/commit/534882978479237a712178e4a2b407be360c5a0c)\n* [nsis: Reorder code blocks](https://github.com/vim/vim/commit/bd6d5c8f0df324b5e1241abb1b3d2be7e6d6f4fb)\n* [nsis: Split gvim.nsi and factor out auxiliary code into auxiliary.nsh](https://github.com/vim/vim/commit/c55efbb148a9022aa7f2c6e87b9c3ca7e844426c)\n* [nsis: Fix indentation and alignment issues in gvim.nsi](https://github.com/vim/vim/commit/f9feda2d6db66bd26a44f52424b430f4cb1ed50f)\n* [runtime(tex): add amsmath support to tex syntax script](https://github.com/vim/vim/commit/05e44e978fc7acb5314ce16f5a41d8e75d34bd21)\n* [9.1.1808](https://github.com/vim/vim/commit/b3740f4b00a78701637a49445adeb20b13e6edf6): Option insecure flags not copied when splitting window\n* [9.1.1807](https://github.com/vim/vim/commit/fec5586a45dac86f0124f1b6dbd9f61eb418313a): :set doesn't clear local insecure flag like :setlocal does\n* [runtime(doc): update list of modifiers at :h expand()](https://github.com/vim/vim/commit/992e30774f5ec81f53d5554c42137d3c85999081)
+* [runtime(help): Update syntax, match legacy header at :help vim9-mix](https://github.com/vim/vim/commit/21d40d2d41f3f0d6463f48118f7924ac8ed7852e)\n* [9.1.1815](https://github.com/vim/vim/commit/ef561cdcde9e25ce1564db32497d3ff99b6b2984): file mode changes in os\_amiga.pro\n* [9.1.1814](https://github.com/vim/vim/commit/4403c674c462e5abcbff99545f5680e847cb35ea): Patch v9.1.1812 causes crashes\n* [9.1.1813](https://github.com/vim/vim/commit/dddde9ce123c665e27faccbcb368ca9e88ed18ed): MS-Windows: title bar is always white\n* [9.1.1812](https://github.com/vim/vim/commit/71b97f29054135151d618433a11ce611ba25844d): completion: flicker with slow LSPs\n* [runtime(doc): Update os-support section for Amiga OS](https://github.com/vim/vim/commit/8f214168bdf2948eb356a048596e70dd1114ee74)\n* [9.1.1811](https://github.com/vim/vim/commit/decc9dd6a2f9434326ee17b9d0b8089ebb227635): Amiga: Initialization of random buffer can be improved\n* [9.1.1810](https://github.com/vim/vim/commit/b3966d6a8e96c9de45a344ec3d42fbb156863835): completion: "longest" doesn't work for manual completion with 'ac'\n* [9.1.1809](https://github.com/vim/vim/commit/c6802f41da83d187f84b90e8b080112af4fbe91a): winclip.pro included in PRO\_AUTO\n* [runtime(doc): Tweak documentation style](https://github.com/vim/vim/commit/3b1901eb53ee02bd8701094f4fd6ad1bebe460e5)\n* [nsis: Load correct readme at the end, refactor gvim.nsi slightly](https://github.com/vim/vim/commit/534882978479237a712178e4a2b407be360c5a0c)\n* [nsis: Reorder code blocks](https://github.com/vim/vim/commit/bd6d5c8f0df324b5e1241abb1b3d2be7e6d6f4fb)\n* [nsis: Split gvim.nsi and factor out auxiliary code into auxiliary.nsh](https://github.com/vim/vim/commit/c55efbb148a9022aa7f2c6e87b9c3ca7e844426c)\n* [nsis: Fix indentation and alignment issues in gvim.nsi](https://github.com/vim/vim/commit/f9feda2d6db66bd26a44f52424b430f4cb1ed50f)\n* [runtime(tex): add amsmath support to tex syntax script](https://github.com/vim/vim/commit/05e44e978fc7acb5314ce16f5a41d8e75d34bd21)\n* [9.1.1808](https://github.com/vim/vim/commit/b3740f4b00a78701637a49445adeb20b13e6edf6): Option insecure flags not copied when splitting window\n* [9.1.1807](https://github.com/vim/vim/commit/fec5586a45dac86f0124f1b6dbd9f61eb418313a): :set doesn't clear local insecure flag like :setlocal does\n* [runtime(doc): update list of modifiers at :h expand()](https://github.com/vim/vim/commit/992e30774f5ec81f53d5554c42137d3c85999081)