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fix(highlight): preserve bg transparency with winblend=100 #34825

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Problem: When winblend=100 is set on floating windows with transparent
background, the desktop background is not visible through the window.

Solution: Add special case to preserve transparency (-1) when blend
ratio is 100% and background was originally transparent.
This commit is contained in:
glepnir
2025-07-10 20:42:45 +08:00
committed by GitHub
parent e644038f06
commit 5803994a1c
2 changed files with 13 additions and 6 deletions
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14
src/nvim/highlight.c
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@ -754,10 +754,16 @@ int hl_blend_attrs(int back_attr, int front_attr, bool *through)
}
// Check if we should preserve background transparency
// Use the raw attributes (before forcing colors) to check original transparency
cattrs.rgb_bg_color = (battrs_raw.rgb_bg_color == -1) && (fattrs_raw.rgb_bg_color == -1)
? -1
: rgb_blend(ratio, battrs.rgb_bg_color, fattrs.rgb_bg_color);
// Special case for blend=100: preserve back layer background exactly (including bg=NONE)
if (ratio == 100 && battrs_raw.rgb_bg_color == -1) {
// For 100% blend with transparent background, preserve the transparency
cattrs.rgb_bg_color = -1;
} else {
// Use the raw attributes (before forcing colors) to check original transparency
cattrs.rgb_bg_color = (battrs_raw.rgb_bg_color == -1) && (fattrs_raw.rgb_bg_color == -1)
? -1
: rgb_blend(ratio, battrs.rgb_bg_color, fattrs.rgb_bg_color);
}
cattrs.hl_blend = -1; // blend property was consumed
HlKind kind = *through ? kHlBlendThrough : kHlBlend;
id = get_attr_entry((HlEntry){ .attr = cattrs, .kind = kind,