patch 8.2.4844: <C-S-I> is simplified to <S-Tab> Commit: https://github.com/vim/vim/commit/758a8d199988b5b25566b2820db60dc2c9de3e58 Author: zeertzjq <zeertzjq@outlook.com> Date: Fri Apr 29 11:06:34 2022 +0100 patch 8.2.4844: <C-S-I> is simplified to <S-Tab> Problem: <C-S-I> is simplified to <S-Tab>. Solution: Do not simplify CTRL if there is also SHIFT. (closes https://github.com/vim/vim/issues/10313)