[3/3] gdiplus: don't draw outside of gradient lines

[Vincent Povirk]

Currently, gradients are drawn by filling a series of quadrilaterals, with one side equal to a gradient line and the other side equal to the edge of the bounding rectangle of the area being filled. A single pixel can be filled many times, and that causes flicker.

After this patch, the fills are much smaller, and each pixel is drawn one time.
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