Closed Issue: FillRectangle off-by-1 [15515]

FillRectangle is drawing 1 extra pixel in the top right corner
 
WriteableBitmapFillExtensions.cs Line 85:
 
for (int x = startYPlusX1; x <= endOffset; x++)
 
Proposed fix:
 
for (int x = startYPlusX1; x < endOffset; x++)