[fixed] Outliner window doesn't auto-scroll when dragging images

[micheus]

Maybe you could blag the code for booleans off ggaliens..

Yes that would have been nice but ggaliens have not opensourced his code,
I can't find it anywhere. So he uses wings code but I can not use his code

Changing a texture file on a material.. I think it's just drag and drop, but it doesn't work if there are so many texture files and materials that they are taller than the window. It need to autoscroll when the mouse gets to the top.

Fixed (on windows) have not tested the other OS's.