I have split up merge request !2 (closed) into smaller pieces. This is part two. In the end, bugs 407244 and 380462 will be fixed.
For the last piece to move, the game actions need to be processed even when the game is over. I have written a unit test (and put the necessary infrastructure into place) to make sure that this is the case.
Indeed, the last piece is moved, but only after the high-score window is closed. The next merge request will make sure that the last piece is moved before the high-score window is shown.