Is it possible set the highlight for a foldcolumn only if add/delete/change in diff mode?
No highlight on that I guess:
...
Folded xxx ctermfg=14 ctermbg=242 guifg=Cyan guibg=DarkGrey
FoldColumn xxx ctermfg=14 ctermbg=242 guifg=Cyan guibg=Grey
DiffAdd xxx ctermbg=4 guibg=DarkBlue
DiffChange xxx ctermbg=5 guibg=DarkMagenta
DiffDelete xxx ctermfg=12 ctermbg=6 gui=bold guifg=Blue guibg=DarkCyan
DiffText xxx cterm=bold ctermbg=9 gui=bold guibg=Red
...