Is there any way to monitor all signals emitted from a widget with GTK3? I know that the event signal is emitted before an event, but I'm not sure of the distinction between "event" and "signal" in GTK terminology - as this does not seem to capture all signals.
I know GDK has a function gdk_set_show_events but this mostly shows events which are sent to the window from the operating system. Is there a GTK3 equivalent?
There is not built in function AFAIK, but I'm sure you can hack something together yourself:
Use g_signal_lookup to get all signal ids for a gtype. Then use g_signal_add_emission_hook on each signal of your instance to register a hook to be called whenever that particular signal is emitted. Inside the hook function, you're provided with the signal id via *ihint, from which g_signal_query should provide you with all the information you need to print debug messages. (I didn't test it, but it should work)
Note that this will unfortunately not work for signals defined with G_SIGNAL_NO_HOOKS.