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
This allows us to report to the backend that the stage's back buffer has been trashed while handling picking. If the backend is keeping track of the contents of back buffers so it can minimize how much of the stage is redrawn then it needs to know when we do pick renders so it can invalidate the back buffer. Based on patch from Robert Bragg <robert@linux.intel.com> https://bugzilla.gnome.org/show_bug.cgi?id=669122