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unexpected control-c propagation to xterm children

A problem, I notice with xterm's, I notice that if I start 'xterm&', then any control-c I press in the base window (running bash) is sent to all xterm children (but not grandchildren).  Control-c _in_ an xterm seems to only be sent to the window one typed control-c into (as would be normally expected).

Note that ^c pressed in a different 'bash' window doesn't have this
effect -- it is only a parent running bash that runs an xterm.
I tried io redirection before xterm (xterm </dev/null 2>&1 >/dev/null&),
to no effect.

When I run xterm I do get some warnings:

Warning: locale not supported by C library, locale unchanged
Warning: locale not supported by Xlib, locale set to C
Warning: X locale modifiers not supported, using default
Failed to open input method

I'm wondering if it is related to the "DISPLAY" env var being
set -- like in the ssh case, somehow setting DISPLAY interferes
with local controls, though 'vi[m]' has no problem intercepting control-c


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