* Motion blur with shutter time > 1 did result in the correct evaluation
of some modifiers because it set the subframe to values > 1, and some
places assume the current frame to be set to the integer coordinate and
the subframe to be a value between 0 and 1.
* Shape keys did not take subframe time offsets into account.
* Point density texture was using an current frame value that was never set.
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