Gtk warnings since r20708

[Geert Janssens]

Hi,

As of r20708 (Fix naming error from r20690. Thanks to Alex Aycinena for 
pointing it out) I get the following gtk warnings in /tmp/gnucash.trace on 
Fedora linux:

* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window0Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window1Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window2Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window3Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window4Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window5Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window6Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window7Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window8Action' to 
action group 'MainWindowActions'
* 14:30:45  WARN <Gtk> Refusing to add non-unique action 'Window9Action' to 
action group 'MainWindowActions'


Since r20708 is a fixup for r20694, which in turn fixes r20690, I also checked 
r20689, which doesn't emit these warnings. So I presume the issue starts in 
one of John's commits related to gnc-main-window.c.

Btw, this warning was a nice opportunity to play with git bisect for the first 
time. The same could be done manually as well, but I find git bisect very 
useful to automate much to the routine in triaging !

Geert