move_region
Description:
Move the part of this indicated by region by dy pixels in the Y direction and
dx pixels in the X direction.
The portions of region that not covered by the new position of region are invalidated.
Child windows are not moved.
Parameters:
| this |
a Window |
| region |
The Region to move |
| dx |
Amount to move in the X direction |
| dy |
Amount to move in the Y direction |