bug #184397 - window resizing slow when window touches the plasma panel. Can't reproduce on NVIDIA GeForce 8600 with 256.35, maybe related to Intel driver. Lemma
If the bug is reproducible on a multiple monitor setup (dual head, dual screen, xrandr, xinerama, twinview), please put it here.
bug #157219 - multiple x display needed for testing this bug FiNeX
XRandR setup
bug #46528 - xrandr needed - Dialog box appears on wrong monitor, Not on the focused one FiNeX
bug #121112 - xrandr with multiple screen settings needed for testing windows placement switching configuration (extending the desktop on a second screen) FiNeX