After a huge filter effects region and filter primitive subregion computation refactor in librsvg, the image tests finally give the correct output!
One complaint I have is the wheel handling of Flickable (which is parent to GridView and other scrollable containers). It's terrible and you can barely scroll stuff properly with the mouse wheel. Weird considering many apps got smooth scrolling right for both wheel and touch (Microsoft Edge is my favorite). https://mastodon.technology/media/baPlXK_D4iF6cOebYYg