drawing selection boxes + shift key bug

[maprezentalok]

Hi again, since in modern rts games it is possible to add units to a selection by pressing shift and clicking on the desired unit or drawing a box while pressing shift key. Maybe this is not implemented in red alert anyway, however drawing selection boxes while pressing shift key (actually any key) makes pointer and selection boxes go weirdo. Selection boxes do not disappear after event, only by scrolling away clears them from display.

Force attacking with CTRL + left click in fog of war is weird too.