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The critical error in quesiont is (SWT:24935): Gdk-CRITICAL **: gdk_window_shape_combine_region: assertion 'GDK_IS_WINDOW (window)' failed and the window pointer is null. On GTK3 it looks like gtk_widget_get_window can not retrieve the window if the widget is not realized.
http://git.eclipse.org/c/platform/eclipse.platform.swt.git/commit/?id=247e8fc7c65396e89730f9de2fd3cb1a9818cbaf
Closing as it's pushed with the commit in previous comment.