vim: Import v9.1.1924

* 9.1.1924: 'commentstring' requires +folding feature
* 9.1.1923: wrong error when assigning to read-only register
* runtime(vim): Update base syntax, match :debug and :break* commands
* runtime(compiler): set errorformat where missing
* runtime(php): Update indent script to 1.76 (from 1.75)
* runtime(haskell): allow spaces in backticked operators in syntax script
* 9.1.1922: Wrong virtcol('$') with virtual text at EOL
* 9.1.1921: xdiff: included xdiff code is outdated
* 9.1.1920: tests: not enough testing for wildtrigger() pum redrawing
* CI: Switch to macOS 26 runner
* runtime(c): Update signal constants in syntax script

Author: github-actions[bot]

gitlog.txt

@@ -1 +1 @@
-* [9.1.1919](https://github.com/vim/vim/commit/ed4af756c2f5f4f0a8092766ddff892cfade24b8): tabpanel: cannot handle mouse clicks in command line\n* [runtime(netrw): Use proper UNC notation for temp files](https://github.com/vim/vim/commit/040a47a470c47240149dbe6bcf88d0a98ed6a5ba)\n* [runtime(compiler): expand errorformats in maven compiler](https://github.com/vim/vim/commit/c2cc63ec7d5dfa2e11e47f5318b11159c0769c49)\n* [runtime(doc): Remove :runtime completion (#11447) todo item](https://github.com/vim/vim/commit/d284277be9314fb2ecd9e19cf466baf146bf3bbf)
+* [9.1.1924](https://github.com/vim/vim/commit/a08030c9f729a133da552b5658e5b59c54581c79): 'commentstring' requires +folding feature\n* [9.1.1923](https://github.com/vim/vim/commit/2447131e00c40dbc4726308c937a5437668493c6): wrong error when assigning to read-only register\n* [runtime(vim): Update base syntax, match :debug and :break\* commands](https://github.com/vim/vim/commit/ea86e53c2b2d4c55d1878d7226b10005cb2e0326)\n* [runtime(compiler): set errorformat where missing](https://github.com/vim/vim/commit/74b4f9242e55d24a7c602a416f1f4ffbfbdb875e)\n* [runtime(php): Update indent script to 1.76 (from 1.75)](https://github.com/vim/vim/commit/d1288503aa0099ab36802312c6dcf3e87751797a)\n* [runtime(haskell): allow spaces in backticked operators in syntax script](https://github.com/vim/vim/commit/ddb88ab796bfb31267767c206684b3dd7ef0d040)\n* [9.1.1922](https://github.com/vim/vim/commit/d434f6c2a571e1fda0582986c28a488e1dce8fff): Wrong virtcol('$') with virtual text at EOL\n* [9.1.1921](https://github.com/vim/vim/commit/6aac7062321ae73efad0e0436f6adaaa52209b94): xdiff: included xdiff code is outdated\n* [9.1.1920](https://github.com/vim/vim/commit/eb33c2eb2815edffab3f4abd4cb8617e37ccca40): tests: not enough testing for wildtrigger() pum redrawing\n* [CI: Switch to macOS 26 runner](https://github.com/vim/vim/commit/55c65c3e4029d4a9fea12e3c118516eeef1e432d)\n* [runtime(c): Update signal constants in syntax script](https://github.com/vim/vim/commit/7fe4b8c1bd34e6bf108a7127903be9508809e17c)