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Remove alpha component of system colors

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When using system colors it may happen (on windows 11 in particular)
that the background color is actually translucid. This is not
something we are prepared to handle and it creates ghosts on screen.

The fix is easy: the alpha channel of the colors is set to 255.

Fixes bug #13084.
This commit is contained in:
Jean-Marc Lasgouttes 2024-07-22 20:36:20 +02:00
parent 8664e2fa4d
commit 095bb18331
1 changed files with 3 additions and 1 deletions
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4
src/frontends/qt/ColorCache.cpp
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@ -86,7 +86,9 @@ QColor ColorCache::get(Color const & color, bool syscolors) const
QPalette::ColorRole const cr = role(color.baseColor);
if (syscolors && cr != QPalette::NoRole) {
static QColor const white = Qt::white;
QColor const c = pal_.brush(QPalette::Active, cr).color();
QColor c = pal_.brush(QPalette::Active, cr).color();
// Change to fully opaque color
c.setAlpha(255);
if (cr == QPalette::Base && c == white)
return lcolors_[color.baseColor];
else