Weird keyboard behavior with "Caps Lock" key

[Frédéric L. W. Meunier]

Something strange happened minutes ago. I was typing and
suddenly all subsequent keys pressed showed as capitals, like
if something reversed the "Caps Lock" key. With it enabled all
showed as lower case.

Then I tested in an open rxvt from where I started the session
and everything showed right. The problem was only on Xfree86,
and I had to restart it.

I'm using all current packages and latest server. Any idea of
what might have caused it or what I can do to track it down if
it reappears ? Nothing in the logs.

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