5bd977dd3c
Creating an FBO may be expensive, so we should avoid the operation if possible. When transitioning between theme nodes, the widget's opacity is used to paint to the offscreen textures which are blended together - this means that the textures have to be recreated each time the widget's opacity changes. It is much more effective to paint the textures at full opacity and respect the widget's paint opacity when blending the textures together. https://bugzilla.gnome.org/show_bug.cgi?id=627085
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