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Add a query implementation to opacity property. Also fix the assert in gtk_css_style_property_register() to allow registering properties with query but without assign function. https://bugzilla.gnome.org/show_bug.cgi?id=760933
0f7b4dad
Add a query implementation to opacity property. Also fix the assert in gtk_css_style_property_register() to allow registering properties with query but without assign function. https://bugzilla.gnome.org/show_bug.cgi?id=760933