richedit: Avoid redundant calls to ME_CalcRunExtent.
ME_SplitRun is only called by wrapping code. In all but one call the returned second half of the split run will be returned, get passed back to ME_WrapHandleRun, then ME_CalcRunExtent will be called at the start of ME_WrapHandleRun through ME_WrapSizeRun.
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