Fix brush cursor size with canvas rotation #1869
Merged
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When rotating the canvas, the brush cursor displays the wrong size. This was because mapRect is used, which will expand the size of a QRect to fit the bounding box of a rotated rectangle. This fix manually applies the view transform to the rect by translating the rect (based on the view translation, scale and rotation) and scaling the rect size without actually rotating the rect.
Fixes #1868.