gtk warning when scrolling tab bar

[Stupidfrog]

Steps to reproduce:
 * Open an application that uses tabs (e.g. GNOME Terminal or gEdit) from a terminal
 * Cause it to have a visible tab bar
 * Scroll the tab bar to switch tabs
 * Note the gtk warning: GtkWarning: gtk_widget_is_ancestor: assertion `ancestor != NULL' failed

--------Original Description-------
Hello

I would like to report the following bug

I open up a new tab with ctrl+shift+T and then try to come back to the first tab.
The application doesn't crash but I get the following error at the prompt: GtkWarning: gtk_widget_is_ancestor: assertion `ancestor != NULL' failed gtk.main()

Thanks

[Chris Jones (cmsj)]

I'm unable to immediately reproduce this...

 * what do you mean by "come back to the first tab" - you just click on the first tab having created a second?
 * which distro are you using?
 * which version of Terminator are you using?
 * which versions of gtk and pygtk are you running?

It might be a subtle incompatibility with particular versions of gtk/pygtk, but I'm not sure.

[Stupidfrog (stupidfrog)]

Yes, that's exactly the case.
I open up terminator (version 0.93), I create a new tab, then I "roll" back to the first tab (using my mouse wheel) and there I get the message at the prompt:

/usr/bin/terminator:74: GtkWarning: gtk_widget_is_ancestor: assertion `ancestor != NULL' failed
  gtk.main()

However, I have just noticed that if I "click" back to the first tab (left mouse click) strangely enough I don't get the error!!?!! Weird??
I guess it's not very important though (if it's not linked in a way to the problem with saving the layout)

For information:
I am running ubuntu 10.04 (x32) and
gtk+2.0: Package: libgtk2.0-dev, Version: 2.20.1-0ubuntu1
pygtk: Package: python-gtk2-dev, Version: 2.17.0-0ubuntu2

Thanks!

[Chris Jones (cmsj)]

Great, thanks.
I'm marking this as Invalid for Terminator because I get the same message when I scroll over any tab (tested in GNOME Terminal and gEdit), which makes me think it's a bug in Gtk+ itself. We can add a task to the bug for that.

[Vikram Ambrose (noel-ambrose)]

I'm having the same problem with Ubuntu-10.04.

[John Lamb (john-lawnjam)]

Getting this in my wxPython project - I've attached a minimal test case which demonstrates the bug, just put the mouse over the Test tab and scroll.