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ZathuraRenderer is a thread pool rendering the pages. Every page widget holds a
ZathuraRenderRequest instance to request its page to be rendered. This object
can also be used to abort the request in case the page is not visible anymore.
Signed-off-by: Sebastian Ramacher <sebastian+dev@ramacher.at>

The plugins expect an image surface but the target of the print context might
not be one.

This reverts commit 82714192.

This needs some looking in the render thread.