Miscellaneous: Mouse click near screen edge toggles windowed mode

[Mesnset]

I use Alt-enter to play in full screen mode (1240x768) on a Radeon 7880 and MB with Intel i5. When I need to click a dialog button near the screen edge, the game switches to windowed mode and the UI windows are moved to different places (repeatably the same different places). I can mitigate this by moving dialog and inventory windows away from the screen edge.

This unintended switch to windowed mode is worse (e.g. clicking more in interior) some times than others.