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|3| | +0#0000000&@70
| +0#af5f00255&@1|2| |1+0#0000000&| @69
| +0#af5f00255&@1|1| |2+0#0000000&| @69
| +8#af5f00255&@1|0| >3+8#0000000&| @69
| +0#af5f00255&@1|1| | +0#0000000&@70
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