[Win32] Improve pixel-to-point conversion precision #2718
      
        
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With recent changes to the rounding of pixel-to-point conversions the calculated sizes became too small in several use cases, leading to cut-off elements. This change adapts the rounding method to reduce the number of relevant cut-offs.
Follow-up to:
How to test
Issues caused by pixel/point conversion roundings can best be seen at 125% or 175% monitor zoom.
Before at 125%:

After at 125%:
