Stops logging after .xsession-errors grows large

[era]

Binary package hint: gdm

When programs are running under a gdm-managed session, it redirects their standard output and standard error to ${HOME}/.xsession-errors of the user running the session. However, it will stop logging to this file once it grows too large for gdm's taste, making it basically impossible to do routine X client troubleshooting after you've kept your session open for a few days (depending somewhat on how chatty your X clients are, of course).

It would be nice if there was a way at least to redirect error messages to a volatile location even after this happens, such as a local socket; or perhaps more usefully, the other way around: make /dev/gdm-errors (or whatever) contain the current log, and copy it to .xsession-errors as before, up to the cut-off point.