4x4 grid + two screens and w/o MR 2388: ``` A1 B1 | A2 B2 C1 D1 | C2 D2 ``` A single window at `C1`, no other windows: - grab the empty space in `C2` and drag it to e.g. `B2` => The window on `C1` is moved to `B1`.
*** This bug has been marked as a duplicate of bug 454151 ***