This is a follow-up of Bug #13928, the current way to check if a theme declares some style or not in order to apply a default one is very inefficient (all the theme has to serialized into a string). As I see, the options are:
- Use a white list to skip that check for some themes (e.g. Greybird)
- Ask upstream to why the GTK_STYLE_PROVIDER_PRIORITY_* doesn't work for this use case (more details on Bug #13928 and https://gitlab.gnome.org/GNOME/glib/issues/1698)
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