vim: Import v8.2.4868

* 8.2.4868: when closing help window autocmds triggered for wrong window
* 8.2.4867: listing of mapping with K_SPECIAL is wrong
* 8.2.4866: duplicate code in "get" functions
* 8.2.4865: :startinsert right after :stopinsert may not work
* 8.2.4864: Vim9: script test fails
* 8.2.4863: accessing freed memory in test without the +channel feature
* 8.2.4862: Vim9: test may fail when run with valgrind
* 8.2.4861: it is not easy to restore saved mappings

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.2.4860](https://github.com/vim/vim/commit/05cf63e9bdca1ac070df3e7d9c6dfc45e68ac916): MS-Windows: always uses current directory for executables\n* [8.2.4859](https://github.com/vim/vim/commit/3a974a89331182139e12386275f052a50c247ecb): wget2 files are not recognized
+* [8.2.4868](https://github.com/vim/vim/commit/2a2707d03337d0bb7d5fd1770238809618653d4a): when closing help window autocmds triggered for wrong window\n* [8.2.4867](https://github.com/vim/vim/commit/ac402f4d64bec6b6efd809fef52f5b34627bf947): listing of mapping with K\_SPECIAL is wrong\n* [8.2.4866](https://github.com/vim/vim/commit/47d4e317f85e4aeb3799d962f173bd0f1e7bc71c): duplicate code in "get" functions\n* [8.2.4865](https://github.com/vim/vim/commit/cd5dbad184e8235beb13dcd8a22302da09db9766): :startinsert right after :stopinsert may not work\n* [8.2.4864](https://github.com/vim/vim/commit/0395f88b84b8917aeff1f7026cf968de0f55ba22): Vim9: script test fails\n* [8.2.4863](https://github.com/vim/vim/commit/c9af617ac62b15bfcbbfe8c54071146e2af01f65): accessing freed memory in test without the +channel feature\n* [8.2.4862](https://github.com/vim/vim/commit/23d44493f1e82365f0a1dbd372fc2546811942f4): Vim9: test may fail when run with valgrind\n* [8.2.4861](https://github.com/vim/vim/commit/51d04d16f21e19d6eded98f9530d84089102f925): it is not easy to restore saved mappings