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-rw-r--r--widget/gtk/WidgetStyleCache.cpp15
1 files changed, 15 insertions, 0 deletions
diff --git a/widget/gtk/WidgetStyleCache.cpp b/widget/gtk/WidgetStyleCache.cpp
index 916d7c4db..c25b426bd 100644
--- a/widget/gtk/WidgetStyleCache.cpp
+++ b/widget/gtk/WidgetStyleCache.cpp
@@ -714,6 +714,21 @@ CreateCSSNode(const char* aName, GtkStyleContext* aParentStyle, GType aType)
gtk_style_context_set_parent(context, aParentStyle);
gtk_widget_path_unref(path);
+ // In GTK 3.4, gtk_render_* functions use |theming_engine| on the style
+ // context without ensuring any style resolution sets it appropriately
+ // in style_data_lookup(). e.g.
+ // https://git.gnome.org/browse/gtk+/tree/gtk/gtkstylecontext.c?h=3.4.4#n3847
+ //
+ // That can result in incorrect drawing on first draw. To work around this,
+ // force a style look-up to set |theming_engine|. It is sufficient to do
+ // this only on context creation, instead of after every modification to the
+ // context, because themes typically (Ambiance and oxygen-gtk, at least) set
+ // the "engine" property with the '*' selector.
+ if (GTK_MAJOR_VERSION == 3 && gtk_get_minor_version() < 6) {
+ GdkRGBA unused;
+ gtk_style_context_get_color(context, GTK_STATE_FLAG_NORMAL, &unused);
+ }
+
return context;
}