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It was used to mark css properties that affect widgets with text, but it caused unnecessary invalidations. E.g. 'color' was marked as AFFECTS_TEXT but changing just the color of a label should not automatically queue a resize, which is what the code in gtk_widget_real_style_updated does. Replace this flag with GTK_CSS_AFFECTS_TEXT_SIZE and GTK_CSS_AFFECTS_TEXT_CLIP, which GtkWidget can use only if the widget actually has text. https://bugzilla.gnome.org/show_bug.cgi?id=791281
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