This question already has an answer here:
I am looking for the feature that KDE, WIn7 and afaik also Unity provide regarding automated resizing of the windows once i drag it against screen borders and let go.
This question has been there before, others were told to install compiz, but that didnt quet change anything.
I am running Xubuntu 12.04 (XFCE), a little hint would be appreciated! :)