(bug 1180942) I think removing XRender will be anyway part of removing support for GTK2. (https://public.etherpad-mozilla.org/p/gfx-code-kill)
Bug 1435586 Comment 2 Edit History
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(bug 1180942) I assume removing XRender will be anyway part of removing support for GTK2? (https://public.etherpad-mozilla.org/p/gfx-code-kill)