Avoid frame of ConfigOverlay going outside the screen
Previously, having a very wide and (vertically) short applet on the desktop, and then dragging it at the top of the screen, would make its right sidebar go outside the screen. This avoids that.
Previously, having a very wide and (vertically) short applet on the desktop, and then dragging it at the top of the screen, would make its right sidebar go outside the screen. This avoids that.