Comment 6 for bug 1390439

Regarding the non-rectangular outline not reflected by gcode output, this needs to be implemented as is stated in the source code (gcode.c:1037):

    /*
     * Currently this is a rather simple implementation, which mills
     * the rectangular extents of the board and nothing else. This should
     * be sufficient for many use cases.
     *
     * A better implementation would have to group the lines and polygons
     * on the outline layer by outer polygon and inner holes, then offset
     * all of them to the right side and mill that.
     */
    /* a better implementation might look like this:
    LAYER_TYPE_LOOP (PCB->Data, max_copper_layer, LT_OUTLINE);
      {
        LINE_LOOP (layer);
          {
            ... calculate the offset for all lines and polygons of this layer,
            mirror it if is_bottom, then mill it ...
          }
        END_LOOP;
      }
    END_LOOP;