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I'm using Xubuntu 13.04 on my laptop that has an external screen attached. The big external monitor also has a vertical panel. My external screen is on the right side of my laptop.

When I maximize windows on my external monitor, the panel overlaps those. However, when I maximize windows on my smaller laptop monitor, there seems to be the panel's width reserved in space (which is just empty)

How can I make it reserve space on the right monitor?

My setup looks like this (generated with arandr and modified (right-of and primary are by me, trying to solve the problem):

xrandr --output HDMI1 --primary --right-of LVDS1 --mode 1920x1080 --pos 1440x0 --rotate normal \
--output LVDS1 --mode 1440x900 --pos 0x368 --rotate normal \
--output TV1 --off --output VGA1 --off
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For anyone looking into this problem, unfortunately this appears to be (a long standing) bug in xfce: Also see my thread on the xfce forums that describe the same issue:

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