Polygon calculation (zones filling): use fast mode when possible (in fact most of time) and strictly simple polygon option only in critical cases (in fact in plot Gerber functions mainly).

In polygon calculations (combining polygons, fracture) the mode of calculation (fast or strictly simple polygon option) as no more a default value, because choosing the best mode is better to optimize the calculation time.

common/common_plotDXF_functions.cpp

@@ -413,9 +413,9 @@ void DXF_PLOTTER::PlotPoly( const std::vector<wxPoint>& aCornerList,
     // Merge polygons to build the polygon which contains the initial
     // polygon and its thick outline
 
-    bufferPolybase.BooleanAdd( bufferOutline ); // create the outline which contains thick outline
-    bufferPolybase.Fracture();
-
+    // create the outline which contains thick outline:
+    bufferPolybase.BooleanAdd( bufferOutline, SHAPE_POLY_SET::PM_FAST );
+    bufferPolybase.Fracture( SHAPE_POLY_SET::PM_FAST );
 
     if( bufferPolybase.OutlineCount() < 1 )      // should not happen
         return;