Segmentation fault when using wx backend
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- Python
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Description
Using `ETS_TOOLKIT=wx`, wx Scene implementation can result in a seg fault.
## The details of the backtrace:
Test the garbage collection of wx Scene implementation. ...
(python2.7:27036): Gtk-CRITICAL **: IA__gtk_widget_set_double_buffered: assertion `GTK_IS_WIDGET (widget)' failed
(python2.7:27036): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(python2.7:27036): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
(python2.7:27036): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(python2.7:27036): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
(python2.7:27036): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(python2.7:27036): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
(python2.7:27036): GLib-GObject-WARNING **: invalid (NULL) pointer instance
(python2.7:27036): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed
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See the Travis CI Log: https://travis-ci.org/enthought/mayavi/jobs/70859123#L6998
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