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Fixed GtkToolItemGroup to avoid deviding by zero when all children
are invisible or there are no children. bgo #613974.

Added gtk_widget_get_events() to the event masks declared by
GtkToolPalette & GtkToolItemGroup.

We should not unref the model here, it might not even exist anymore.
Instead check if it exists and only use it if it does.
The unref was leftover from a previous fix in
ba9f5339.

Spotted by Matthias Clasen in
https://bugzilla.gnome.org/show_bug.cgi?id=614099

This fixes bug 613887.

Hiroyuki Ikezoe authored Dec 22, 2009 and Javier Jardón committed Mar 25, 2010

Add a stub for gdk_keymap_map_virtual_modifiers.

Thank you libpng, for typedef unsigned long png_uint_32.

In certain cases the menu label of a notebook page will be reused after the
page was removed from the notebook, for instance when a page is dragged from
one notebook to another. For such cases make sure that the menu label isn't
destroyed as part of destroying the menu item it was in.

Another parallel build fix, see bug 610946.

One needs to add an explicit dependency between the gir files and the
.la libtool wrapper as this dependency is not added automatically by
Makefile.introspection. Not adding these breaks parallel builds as make
does not wait for the .la to be generated before launching g-ir-scanner.