That was the case in the early days of GTK3, but I don't think it is anymore. If GTK3 still does not support theming, that explains why theming causes issues.

That was the case in the early days of GTK3, but I don't think it is anymore. If GTK3 still does not support theming, that explains why theming causes issues. In which case it would be better to implement proper theming support because stopping distributions from theming clearly doesn't work.