Minecraft window switched back to previous resolution upon unfocusing and refocusing window

In Windows 8, there is a feature where you can drag a window to the edge of the screen to auto set the resolution to that half of the screen, this is a feature I regularly use when playing minecraft. In 1.6, there has developed a problem with this, whenever I use this method to auto set the resolution, it works, but if I unfocus the minecraft window (as in click away to another window) and then refocus it (In any way, click the window, click the menu icon, alt+tab to it), the minecraft window readjusts to it's original resolution before windows auto adjusts it. I can get around the problem by manually adjusting the resolution, but this is a bug non the less.