vim: Import v8.2.4586

* 8.2.4586: Vim9: no error for using lower case name for "func" argument
* 8.2.4585: cannot use keypad page-up/down for completion menu
* 8.2.4584: error for using autoload function in custom completion

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.2.4583](https://github.com/vim/vim/commit/4f6e772c9cd013a8690ab0f1efecc0ab3e855148): screendump test fails\n* [8.2.4582](https://github.com/vim/vim/commit/4c8b546da2059865e20902586bb3e0ff07c279a0): useless code handling a type declaration\n* [8.2.4581](https://github.com/vim/vim/commit/d597ab00d799aa078be32e6677e01a7582106105): null types not fully tested\n* [8.2.4580](https://github.com/vim/vim/commit/21dc8f1527fc41405b26a26bb0c318c4b7c1b5d4): Vim9: incorrect error for shadowing variable\n* [8.2.4579](https://github.com/vim/vim/commit/5cffa8df7e3c28681b9e5deef6df395784359b6b): cannot use page-up and page-down in the cmdline popup menu\n* [8.2.4578](https://github.com/vim/vim/commit/fe8e9f674036f3206b0080f4a931c991cf142f8b): no warning when autoload script for completion has an error\n* [8.2.4577](https://github.com/vim/vim/commit/9323ca51c2b1522f26907a7b8879067245ebd1be): message test is flaky
+* [8.2.4586](https://github.com/vim/vim/commit/1d9cef769d6c91d9a58a9c3c1c8ffe3da3570871): Vim9: no error for using lower case name for "func" argument\n* [8.2.4585](https://github.com/vim/vim/commit/155b0882088ff115dcfb6ce466fe7c8cc2bef349): cannot use keypad page-up/down for completion menu\n* [8.2.4584](https://github.com/vim/vim/commit/da6d42c35a68610af872551b03077047258a7551): error for using autoload function in custom completion