When moving a window by left-clicking at the top of the window and dragging up, or to the left or right, the window will re-size as soon as the pointer reaches the screen edge. For right or left the window is placed at the corresponding side of the screen, but for a top of screen "hit", the window will be maximized. Because the pointer is so near the upper border of the window, it is difficult to avoid triggering the full-screen switch when all I want to do is to position the window at the top of my screen.