Gradient brushes are created with CanvasEdgeBehavior::Wrap by default

[davidni]

The CsConsumer Gradients demo uses a radial gradient brush and a linear gradient brush, both of which are created with CanvasEdgeBehavior::Wrap. This causes the edge of the drawn shapes to show an undesirable border (in the case of the circle, a bad-looking dark border; in the case of the rectangle, a thin red line in the purple end).

IMHO using CanvasEdgeBehavior::Clamp by default would make more sense, and I already have a fix that does that in my fork. I'll send a PR shortly.

Here's a screenshot of the circle looking particularly bad: