patch 9.0.1578: SpellCap highlight not always updated when needed Commit: https://github.com/vim/vim/commit/2ac6497f0ef186f0e3ba67d7f0a485bfb612bb08 Author: Luuk van Baal <luukvbaal@gmail.com> Date: Thu May 25 17:14:42 2023 +0100 patch 9.0.1578: SpellCap highlight not always updated when needed Problem: SpellCap highlight not always updated when needed. Solution: Handle updating line below closed fold and other situations where only part of the window is redrawn. (Luuk van Baal, closes #12428, closes #12420)

> +0&#ffffff0@74
|~+0&#e0e0e08| @73
|~| @73
|~| @73
|~| @73
|~| @73
|~| @52|o+0#0000001#ffd7ff255|t|h|e|r| |t|a|b| @11
|~+0#0000000#e0e0e08| @52|a+0#0000001#ffd7ff255| |c+0#ff404010&|o|m@1|e|n|t| +0#0000001&|l|i|n|e| @6
|:+0#0000000#ffffff0| @52|t+0#0000001#ffd7ff255|h|i|s| |l|i|n|e| |w|i|l@1| |n|o|t| |f|i
| +0#0000000#ffffff0@53|t+0#0000001#ffd7ff255| |h|e|r|e| @14