Bug#788849: accerciser: unhandled exception in QuickSelect "inspect accessible under mouse" for some widgets

[ydirson at free.fr]

Package: accerciser
Version: 3.14.0-1

If eg. I'm inspecting a yelp window, Ctrl-alt-? over a button in the title bar
does bring me to the correct item , but over a "next" button inside a help window,
I get and exception:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/accerciser/accessible_treeview.py", line 304, in _popOnIdle
    parent = self[iter][COL_ACC]
  File "/usr/lib/python3/dist-packages/gi/overrides/Gtk.py", line 1075, in __getitem__
    return self.model.get_value(self.iter, key)
TypeError: Couldn't find foreign struct converter for 'cairo.Context'

Afterwards, the only side-effet I observed thus far is that the mouse pointer over
the tree pane is left as "waiting cursor"