Created attachment 52627 [details]
Contains the iframe that loads content.html
Rendering errors for the fixed position elements when scrolling the contents of the iframe up and down when using copy scrolling optimization. If the content itself is loaded directly (i.e. without the iframe) there are no artifacts.
Created attachment 52628 [details]
The content of the iframe
This is due to my current implementation.
The new implementation should not have the issue because the repaint rect take into account the border. I add this task as a dependency of 33150 to remind us to test the new implementation with this use case.
Benjamin: ping. Can we close this?
(In reply to comment #3)
> Benjamin: ping. Can we close this?
I verified with 4.7 and 4.6, the new implementation does not have this issue.