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-rw-r--r--widget/gtk/nsLookAndFeel.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/widget/gtk/nsLookAndFeel.cpp b/widget/gtk/nsLookAndFeel.cpp
index 562eaa97b..d2b82e495 100644
--- a/widget/gtk/nsLookAndFeel.cpp
+++ b/widget/gtk/nsLookAndFeel.cpp
@@ -75,6 +75,7 @@ ApplyColorOver(const GdkRGBA& aSource, GdkRGBA* aDest) {
aDest->red = sourceCoef * aSource.red + destCoef * aDest->red;
aDest->green = sourceCoef * aSource.green + destCoef * aDest->green;
aDest->blue = sourceCoef * aSource.blue + destCoef * aDest->blue;
+ aDest->alpha = resultAlpha;
}
}