Begins a window move operation (for a toplevel window).
This function assumes that the drag is controlled by the client pointer device, use begin_move_drag_for_device to begin a drag with a different device.
| this |
a toplevel Window |
| button |
the button being used to drag, or 0 for a keyboard-initiated drag |
| root_x |
root window X coordinate of mouse click that began the drag |
| root_y |
root window Y coordinate of mouse click that began the drag |
| timestamp |
timestamp of mouse click that began the drag |