patch 8.2.4338: an error from an expression mapping messes up the display Commit: https://github.com/vim/vim/commit/74a0a5b26d0180f3ea89e9495dff6a26f0df23cb Author: Bram Moolenaar <Bram@vim.org> Date: Thu Feb 10 14:07:41 2022 +0000 patch 8.2.4338: an error from an expression mapping messes up the display Problem: An error from an expression mapping messes up the display. Solution: When the expression results in an empty string return K_IGNORE. In cmdline mode redraw the command line. (closes #9726)

>1+0&#ffffff0| @73
|2| @73
|3| @73
|4| @28| +0#0000001#ffd7ff255|T|i|t|l|e| |S|t|r|i|n|g| | +0#0000000#ffffff0@30
|5| @28|o+0#0000001#ffd7ff255|n|e| @10| +0#0000000#ffffff0@30
|6| @28|t+0#0000001#ffd7ff255|w|o| @10| +0#0000000#ffffff0@30
|7| @28|a+0#0000001#ffd7ff255|n|o|t|h|e|r| @6| +0#0000000#ffffff0@30
|8| @73
|9| @73
@57|1|,|1| @10|T|o|p|