#406 Graphics glitches when dragging 3 screens

[Neil Cafferkey]

If three screens are open (I used workbench, Editor and DOpus), various graphical glitches occur when dragging them:
1.The background screen sometimes flickers through when dragging a foreground screen. (X11 and VESA)
2. The middle screen sometimes disappears, and can be "painted" back with the mouse pointer. (VESA)
3. After putting the middle screen to the back by shift-clicking on its depth gadget, the depth gadget remains visible. (X11 and VESA)

[Neil Cafferkey]

This was fixed by Kalamatee, but I don't know exactly when.