kde 4.4 + twinview = weird screen artifact

[albright]

I have a twin monitor setup using twinview (nvidia 9600GT)
using nvidia-drivers 190.53-r1

What is weird is that if I drag a window from one screen to the
other there is a point (roughly when the window is 3/4 of way
across the screen division) when a white frame appears which
is always of size full vertical and say 20% horizontal or so.

If I release the mouse button when this frame is visible
the window I'm dragging snaps into the frame and resizes
to the frame's size (so I can't get a screenshot).

I can continue to drag the window past the point where
the frame appears and everything behaves normally.

I wonder if anyone knows what's going on here.

Edit: Of course, using the delay with ksnapshot I can get a
screenshot, here: www.utsc.utoronto.ca/seager/strange.jpg
if anyone is interested
_________________
.... there is nothing - absolutely nothing - half so much worth
doing as simply messing about with Linux ...
(apologies to Kenneth Graeme)

[yther]

I believe this is a feature that was recently added to KDE's window manager, which mimics a similar behavior in Windows 7. Dragging a window to a side of the screen will cause it to snap to 50% of the screen. You are passing through this zone as you drag from one monitor to the other, which triggers the snap indicator.

"It's not a bug, it's a feature..." although it's a feature many people don't care about.

[albright]