Vladimir,
Your commit 2962, that modify gr_basic.cpp, and use ClipAndDrawFilledPoly to clip rectangles is incorrect
Using ClipAndDrawFilledPoly instead of old code has 2 issues:
-1 Rectangles outside the draw area are are still drawn
-2 Rectangles having outlines drawn with a thick pen are drawn with outlines around the draw area.
ClipAndDrawFilledPoly uses Sutherland Hodgman algorithm that do not remove polygon outlines,
and can be used *only* to clip filled polygons having no thick outlines,
i.e. when they are no outline to draw (just a filled area),
therefore not to clip rectangles that outlines must be drawn.
Please, go back to the old code.
