b78b8c9578977f65a1fefb406a1b6178a251cb4f

When blitting an offscreen onto an onscreen, the whole offscreen should always be drawn on the whole onscreen. Thus, don't try to convert between coordinate spaces, just draw the whole offscreen on the whole onscreen. https://bugzilla.gnome.org/show_bug.cgi?id=770672
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