Re: Theme dev (Selenized) help: SpellRare and undercurl not working in Vim, works in NeoVim

If I do that:

$ cat > test.vim <<EOF
set spellfile=/tmp/en.utf8.add spelllang=en_us spell t_Co=256
hi clear

hi SpellBad guisp=red gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=undercurl cterm=undercurl
hi SpellCap guisp=orange gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=undercurl cterm=undercurl
hi SpellRare guisp=blue gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=undercurl cterm=undercurl
hi SpellLocal guisp=green gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=undercurl cterm=undercurl

spellrare emacs
call setline(1, 'is your favourite edditor vim or emacs?')
EOF

$ vim -f -g --clean -S test.vim # Gives the expected undercurl in
gvim-gtk3 (good)
$ vim --clean -S test.vim # No undercurl and no underline in terminal (bug!)

I expected that vim should fallback to underline in the terminal
since the doc says:

=== BEGIN QUOTE :help undercurl ===
"undercurl" is a curly underline. When "undercurl" is not possible
then "underline" is used. In general "undercurl" and "strikethrough"
is only available in the GUI.
=== END QUOTE ===

A workaround is to use term=underline cterm=underline
instead of term=undercurl cterm=undercurl as in this example:

$ cat > test.vim <<EOF
set spellfile=/tmp/en.utf8.add spelllang=en_us spell t_Co=256
hi clear

hi SpellBad guisp=red gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=underline cterm=underline
hi SpellCap guisp=orange gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=underline cterm=underline
hi SpellRare guisp=blue gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=underline cterm=underline
hi SpellLocal guisp=green gui=undercurl guifg=NONE guibg=NONE
ctermfg=NONE ctermbg=NONE term=underline cterm=underline

spellrare emacs
call setline(1, 'is your favourite edditor vim or emacs?')
EOF

Then it works as expected:

$ vim --clean -S test.vim # underline in terminal (good)

But still, I think that term=undercurl cterm=undercurl should
have a fall-back on underline automatically.

Regards
Dominique

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