[vim/vim] Highlight groups's performance is different in termguicolor for some groups. (Issue #20413)

[Mao-Yining]

mao-yining created an issue (vim/vim#20413)

Steps to reproduce

vim --clean -S a.vim

a.vim:

set termguicolors
hi SpellBad guifg=NONE guibg=NONE guisp=#d20f39 gui=undercurl ctermfg=161 ctermbg=NONE cterm=underline term=underline
hi SpellBad

On cmd.exe

default.png (view on web)

On msys2

default.png (view on web)

Expected behaviour

default.png (view on web)

Version of Vim

9.1.506

Environment

MS-Windows Windows Terminal and Consle and Msys consle

Logs and stack traces

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