Situation: The current situation is that if you set the top and bottom panels to auto-hide, they only hide partially. I guess this is by design, but in my opinion it looks like a bug. Suggestion: Completely hide the 2 pixels high panels when they are set to auto-hide. It looks ugly with those 2 pixels high grey areas and steal some pixels from other windows. My System: I run Intel x86_64 and Ubuntu 12.04, but I guess this bug applies to all systems?
This isn't xfdesktop related, moving to xfce4-panel.
This problem is still there in 4.12 and I agree, it is really ugly. There is currently the option to decrease the width of this remaining bar using a .gtkrc-2.0 file in your home directory as described here: http://docs.xfce.org/xfce/xfce4-panel/theming However the minimal possible value is 1, setting it to 0 results in the default width of 3 again. Weirdly I only see this problem with top and side panels, on the bottom panel there is no remaining bar after hiding.
What you can do to work around this is to make the panel fully transparent on leave. And yes, the 1px min height is by design.
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