screen crashes on 11.3-STABLE

[Christoph Moench-Tegeder]

That already had been reported here:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241538 by Marcin.

My analysis: screen dumps core on terminals with TERM=xterm* or
TERM=rxvt* if they don't advertise Km ("key_mouse") capability
via termcap. A workaround is to set TERM to xterm-vt220 (which has
Km) (you could just set resource XTerm*termName to "xterm-vt220"
or use command line "xterm -tn xterm-vt220").
Patch at the PR.

Regards,
Christoph

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