(Modified 2013 Aug 28)
Disabling auto-maximize when dragging window to top of screen
For XFCE 4.10
Starting with Xubuntu 12.10, which uses XFCE 4.10, dragging a window to the top of the screen caused its width to be maximized (but not its height). The way to undo this change in behavior, I found on XFCE.org.
This setting is found in a checkbox:
Settings Manager > Window Manager Tweaks > Accessibility > Automatically tile windows when moving toward the screen edge
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