Manual Reference Pages - TKERROR (n)
tkerror - Command invoked to process background errors
Note: as of Tk 4.1 the tkerror command has been renamed to
bgerror because the event loop (which is what usually invokes
it) is now part of Tcl. For backward compatibility
the bgerror provided by the current Tk version still
tries to call tkerror if there is one (or an auto loadable one),
so old script defining that error handler should still work, but you
should anyhow modify your scripts to use bgerror instead
of tkerror because that support for the old name might vanish
in the near future. If that call fails, bgerror
posts a dialog showing the error and offering to see the stack trace
to the user. If you want your own error management you should
directly override bgerror instead of tkerror.
Documentation for bgerror is available as part of Tcls
background error, reporting
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