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Yasuhiro Matsumoto
7b218ae98c
Problem: popup: opacity blend may leaks white bg color
Solution: Add cterm color blending for 256 color terminals, use
COLOR_INVALID() macro to check for invalid color
(Yasuhiro Matsumoto)
When a textprop highlight only set gui=undercurl/guisp (no fg/bg), the
CTERMCOLOR sentinel was treated by hl_blend_attr() as a real near-white
color, leaking white bg onto textprop-covered cells under an opacity
popup or pum. Add a cterm color blending path that approximates blends
in the xterm 256-color palette using the gui RGB when available, so
opacity now has a visible effect even without 'termguicolors' (in
256-color terminals). Below 256 colors the blend is skipped.
Also document the requirement (GUI, 'termguicolors', or 256-color
terminal) and update existing pumopt/popupwin opacity screendumps to
reflect the new blended output.
closes: #20095
Signed-off-by: Yasuhiro Matsumoto <mattn.jp@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
