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Defer widget unallocation until all get_style_context/get_pango_context references are gone

Submitted by Marius Gedminas @mgedmin

Link to original bug (#678607)

Description

The following code causes a segfault in pygobject-introspection 3.3.2 in Ubuntu oneiric nightly CD images:

$ python
>>> import gi
>>> from gi.repository import Gtk
>>> Gtk.MenuBar().get_style_context().get_color(Gtk.StateFlags.NORMAL)

This was originally reported as a bug against gtimelog in Ubuntu, you can see the full output of Gtk+ and Python warnings as well as a stack trace with debug symbols at https://bugs.launchpad.net/gtimelog/+bug/1016212

Some background: I'm the author of GTimeLog. The crashing one-liner is my poor attempt to determine the color (dark/light) of the Gtk+ theme so that I could choose an appropriate image for an GtkStatusIcon when the user is running gnome-panel or Unity desktops.