when dragging map, release over button on bottom presses that button

[Nathan-P-B]

OS: "real" Windows XP 32-bit
version: DQ2 0.0.4 / TDRPG 0.0.4 (files dated 2014-06-13)

When dragging the world map around, it is possible to move the mouse cursor over the button bar on the bottom of the screen and still drag the map. (This is convenient.) The problem is that if the cursor is over a graphical button when the mouse is released, the graphical button is pressed. The mouse up event should just do whatever is normally done when the map dragging is completed (basically nothing). (In general, the graphical button should only be pressed when a mouse-button-up event occurs on the same button as the previous mouse-button-down event.)