Helping Cairo - https://people.gnome.org/~federico/blog/helping-cairo.html
For example, this bug took months to “fix” because Hangouts/GMail used a PNG as sprite sheet with a height of 33K px and we were blinded by the possibility that the accelerated compositing code would be to blame (which would be more likely), and it wouldn't be reproducible for everybody because some people wouldn't get the huge sprite sheet → https://bugs.webkit.org/show_bug.cgi?id=168964#c49
(Note: the “fix” was to just disable rendering of huge images, so it is actually a workaround 😥 )
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