vim: Import v8.2.4606

* 8.2.4606: test fails because of changed error message
* 8.2.4604: error for redefining a script item may be confusing
* 8.2.4603: sourcing buffer lines is too complicated

Author: chrisbra

gitlog.txt

@@ -1 +1 @@
-* [8.2.4602](https://github.com/vim/vim/commit/397a87ac1c9857eb0d5ec3add69e3b9ab6b0c77c): Vim9: not enough test coverage for executing :def function\n* [8.2.4601](https://github.com/vim/vim/commit/efd73ae5d2a533670f562b6df5be2ffeb091185d): Vim9: not enough test coverage for executing :def function\n* [8.2.4600](https://github.com/vim/vim/commit/6b8c7ba062ca4b50e8f983e0485be7afa4eef691): Vim9: not enough test coverage for executing :def function\n* [8.2.4599](https://github.com/vim/vim/commit/a4df834a92535cf124afd1c3b711b4a7109e3534): GTK: get assertion errors when scrolling a split window\n* [8.2.4598](https://github.com/vim/vim/commit/7e0be3ea211748a77d32cb1d3d35ecfc246cf0f2): profile completion test sometimes fails\n* [8.2.4597](https://github.com/vim/vim/commit/b6643d10d39c493951a6bbf3264003d35adeb811): LuaV\_debug() not covered by tests\n* [8.2.4596](https://github.com/vim/vim/commit/c670ebddcd9e64411fc21571c2da3053ac39e4c9): installing tutor binary may fail\n* [8.2.4595](https://github.com/vim/vim/commit/6f953636771fe90e593b1c0ec883c261f6dc1bbb): X11: using --remote-wait may keep the CPU busy\n* [Update runtime files](https://github.com/vim/vim/commit/47c532e2bc55e8a48f7f47e1fae1ed30144f2fa1)
+* [8.2.4606](https://github.com/vim/vim/commit/e18acb02bb58b2e07f3a52ce619752ba39c05ea2): test fails because of changed error message\n* [8.2.4604](https://github.com/vim/vim/commit/6d877fe0181bdaf382bfc87898e1ddf6e3c78e66): error for redefining a script item may be confusing\n* [8.2.4603](https://github.com/vim/vim/commit/85b43c6cb7d56919e245622f4e42db6d8bee4194): sourcing buffer lines is too complicated