That is for debug only; are those messages at all
linked
with the
BadWindow messages? If not they will be removed in
the next SVN commit.
They appear many times successively and not associated with any BadWindow messages.
They appear only after I log out and exit X.
Perhaps such messages should look something like this:
[systemtray] Debug test: Clearing area to set background
As much as I hate those messages, I would vote to place that item at the top of the to-do
list for 3.5.13. I'll submit a priority 1 bug report if you want. Your call.