Follow-up Comment #1, bug #4929 (project wormux):

Bad solution (bad coordinates :      

      filledPolygonRGBA (app.sdlwindow, 
                         &quad.x1,
                         &quad.y1,
                         4, 
                         213,198,181,255);

+      // For the cache mechanism 
+      world.ToRedrawOnScreen(Rectanglei(quad.x3, quad.y3, quad.x1-quad.x3,
quad.y1-quad.y3));

      lineRGBA(app.sdlwindow, quad.x1, quad.y1, quad.x4, quad.y4, 
               95,95,95,255);
      lineRGBA(app.sdlwindow, quad.x2, quad.y2, quad.x3, quad.y3, 
               95,95,95,255);

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