Polygon Rendering glitch

[kmq]

Polygons rendered via the Highlight class look wrong when they hit the corner of the map. Instead of just being moved out of the visible area, some magic is applied that cuts them off. The spell is only correct for polygons being moved out beyond an edge: The nonvisible points are removed and a line is drawn between the points on the polygon that cross the border. When a polygon is moved beyond two edges (that is, a corner) the same spell is cast and the triangle between the corner, and the two points where the polygin hits an edge is shown as empty.

[verenadiewald]

​http://trac.osgeo.org/mapbender/changeset/8672