[vim/vim] undercurl is not used in a terminal that takes it unless t_Cs is set (PR #21413)

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h_east

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Sep 30, 2026, 2:43:48 PM (20 hours ago) Sep 30

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Problem:  Undercurl is shown as a plain underline in a terminal that
          takes the curly underline, such as Windows Terminal, unless
          the user sets t_Cs and t_Ce.
Solution: When t_Cs is empty and the terminal ignores an unknown DCS
          string, ask it with DECRQSS whether it takes "\e[4:3m", and
          set t_Cs and t_Ce when it does.  Add "undercurl" to
          terminalprops().

With 'termguicolors' in Windows Terminal, the undercurl also needs
#21412 to be merged, which makes t_8u use colons.

You can view, comment on, or merge this pull request online at:

https://github.com/vim/vim/pull/21413

Commit Summary

3382aa8 undercurl is not used in a terminal that takes it unless t_Cs is set

File Changes

(4 files)

Patch Links:

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