windows 7: how to turn off auto-expansion of windows shoved to the edge of the screen

A windows thing that was driving me crazy, with my habit of mouse-button down, wrist flick, to shove windows out of the way from the window I wanted to look at.  In the version of Windows that arrived with new PC's, the wrist-flick was causing the unwanted window to expand and fill the entire screen.

To turn this off, under control panel, select "Ease of Access", then "Change how your mouse works".  Then check the box that says:

Prevent windows from being automatically arranged when moved to the edge of the screen.

Control Panel\Ease of Access\Ease of Access Center\Make the mouse easier to use\