vim: Import v8.2.4621

* 8.2.4621: crash when using the tabline right-click menu
* 8.2.4620: two letter substitute commands don't work
* 8.2.4619: mapping is cancelled when mouse moves and popup is visible
* 8.2.4618: cmdline completion does not recognize single letter commands
* 8.2.4617: no completion for :scriptnames

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.2.4616](https://github.com/vim/vim/commit/98b7fe725ec342d28d7c86293098b233c57c4af9): Vim9: Declarations in a {} block of a user command remain\n* [8.2.4615](https://github.com/vim/vim/commit/ac48506ac62b2ece523d5af6ea6c95b699d70b94): mapping with escaped bar does not work in :def function\n* [8.2.4614](https://github.com/vim/vim/commit/c20e46a4e3efcd408ef132872238144ea34f7ae5): redrawing too much when 'cursorline' is set\n* [8.2.4613](https://github.com/vim/vim/commit/3c5999e53d9f35a30abefb7224f66a75c8ffb009): return type of swapfile\_unchanged() is wrong\n* [8.2.4612](https://github.com/vim/vim/commit/a915fa010330ee7212e06d3511acd363d04d2d28): Vim9: cannot use a recursive call in a nested function
+* [8.2.4621](https://github.com/vim/vim/commit/9dd42a631162a8561bd7c4b0e89afd21f7994d8c): crash when using the tabline right-click menu\n* [8.2.4620](https://github.com/vim/vim/commit/1e2c4175dce903986dac66ba9326ae562b159421): two letter substitute commands don't work\n* [8.2.4619](https://github.com/vim/vim/commit/f8e43f6107f3a83b8c74a84c4c8f99598e2dc4c0): mapping is cancelled when mouse moves and popup is visible\n* [8.2.4618](https://github.com/vim/vim/commit/f4f0525c34d2aa32f214155b0dadcd274ed05dd1): cmdline completion does not recognize single letter commands\n* [8.2.4617](https://github.com/vim/vim/commit/454ce6737cadb82886f1fc0eb9e8666cc59ae42b): no completion for :scriptnames