Bug#521905: I can confirm this.
I can confirm this bug. I was about to file it myself.
I have an ATI Radeon X300 using the foss radeon driver. I have dual
monitors set up using xrandr.
Using kwin 3.5.9.dfsg.1-6 (stable) my setup works perfectly. When I
upgraded to 3.5.10.dfsg.1-2 (testing), kwin maximizes windows across
both screens, which is very annoying.
It seems to have lost the idea that my monitors are separate, despite
the fact that in the "configure desktop" -> display -> multiple
monitors dialog, I correctly had the two screens divided and kwin
should be obeying these settings.
This is despite KDE itself knowing I have two separate monitors --
they both show up separately in that dialog, they identify properly
when I hit "identify screens", and backgrounds are properly broken
across them rather than stretching.
It's very annoying, to say the least -- I had to downgrade! Hope this
can be fixed.
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