patch 9.0.0294: crash when 'cmdheight' is 0 and popup_clear() used Commit: https://github.com/vim/vim/commit/43568648dfefe5796dc3fe8fe711135eb20d9eb6 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 28 13:02:45 2022 +0100 patch 9.0.0294: crash when 'cmdheight' is 0 and popup_clear() used Problem: Crash when 'cmdheight' is 0 and popup_clear() used. Solution: Reset "message_win" when the message popup is cleared. Close the popup when 'cmdheight' is non-zero. Add a screendump test.

| +0#af5f00255#ffffff0@1|0| >a+0#0000000&@4| @65
| +0#af5f00255&@1|1| |b+0#0000000&@4| @65
| +0#af5f00255&@1|2| |c+0#0000000&@4| @65
| +0#af5f00255&@1|3| |d+0#0000000&@4| @65
|~+0#4040ff13&| @73
|~| @73
|~| @73
| +0#0000000&@56|4|,|1| @10|A|l@1|