84f55440a3c6317dd2ab5d7e3d638016609e4d03
Best guess right now is that optimization does something bad when ceil() is called twice on a very large dbl-precision number, which results in a zero (empty) redraw area. Without the removal of the redundant ceil & floor functions, no expose events would be delivered to the canvas in an optimized build during drags (and maybe more).
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