I have now discovered that when the panel gets into this spin, it can be
stopped by opening the panel properties and changing it from 'Normal
height' to 'Full height'. This causes the vertical panel to expand to
fit the height of the screen. The juddering stops, and the CPU usage of
the panel process drops to what I presume is normal: 1.5% - 2%. (I find
it a little odd that the process is not more idle.)
I have to say I am seriously considering ditching XFCE because of this
problem. I reported the bug 6 days ago, and there has been no
acknowledgement or response other than automated replies from your
system. There is no indication of the status of this bug within your
system. The bug has not found its way through to XFCE's bug tracking
system. I can conclude only that you are not maintaining this within
Debian.
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