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Draw textured bezier line through start and end points with the given tangents. To get an anti-aliased effect use a texture that is 1x2 pixels with one transparent white pixel and one opaque white pixel. The bezier curve will be swept using this texture.
Note: Use HandleUtility.GetHandleSize where you might want to have constant screen-sized handles.
Bezier Line in the Scene View.
And the script attached to this Handle: