patch 9.0.0458: splitting a line with a text prop "above" moves it down Commit: https://github.com/vim/vim/commit/3b93cf218fc70897c11de0415221e7899e9a527a Author: Bram Moolenaar <Bram@vim.org> Date: Tue Sep 13 18:34:18 2022 +0100 patch 9.0.0458: splitting a line with a text prop "above" moves it down Problem: Splitting a line with a text prop "above" moves it to a new line below. Solution: Keep an "above" text prop above the first line.

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|4|8| @9|║+0#0000001#ffd7ff255| |t|h|e| |t|e|x|t| |║| +0#0000000#ffffff0@50
|4|9| @9|╚+0#0000001#ffd7ff255|═@9|╝| +0#0000000#ffffff0@50
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