Alt+RightClick: Resize appropiate corner depending on cursor position in window

[tomas]

As discussed here.

PS. I'm not an expert at C so I hope this doesn't break anything or produce memleaks. :)

[tomas]

No interest?

[Obarun]

I asked for this feature from a while now, but apparently this is not their priority. I think i will try your commit...

[legkamran]

its really amazing!