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Changing the theme to Adwaita was causing the Adwaita.css style provider to get added after the nautilus.css style provider. This caused the Adwaita.css provider to override the nautilus.css provider, because the behavior of two style providers with the same priority is undefined and gtk happens to prefer the style provider that got added last. https://bugzilla.gnome.org/show_bug.cgi?id=765687
1587ee87