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Currently in various place, gtk_style_context_get_color() and gtk_style_context_get_background_color() are used to get and replicate the color a color to an other place. The later is deprecated in GTK3 and removed in GTK4. So this commit uses other means to get the background color. Since the get_color() function is quite inexpressive in the sense that you don't really know which color you'll get (like the get_background_color()), this commit also replaces those uses by more saner ones.
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