Re: Tracking Gtk2 error messages

[Torsten Schönfeld <kaffeetisch gmx de>]

On 14.06.2015 04:58, Ian Chapman wrote:
> How do I determine which widget is the cause of errors such as this?
>
> Gtk-CRITICAL **: IA__gtk_widget_grab_default: assertion
> 'gtk_widget_get_can_default (widget)' failed

If you don't mind using a debugger and reading C backtraces, set the 
environment variable G_DEBUG to "fatal-criticals" and run your program 
through the debugger.  For example, with gdb:

  G_DEBUG=fatal-criticals gdb --args perl app.pl
  gdb> r
  ... critical error, program stops
  gdb> bt
  ... backtrace ...

The backtrace should contain some hint about what's going on.