Comment by ben-schaaf

Wow, that's quite silly - and might partially explain some of the worsening battery life on Android. GTK4 also removes such an API, but just like those docs say, dirty rects are still calculated internally. You can enable the same visual debugging in GTK4 and see that dirty rects are done the same as they always have been.

Chrome on desktop has an option for flashing whenever it paints and it only highlights the line of text you're typing on. So clearly chrome still tracks dirty rects properly.