GTK_WIDGET_FLAGS deprecation

[John Darrington]

commit ef7f207a277f2fa2710115bd21b9c2147860f5af
Author: Ben Pfaff <address@hidden>
Date:   Fri May 6 20:56:18 2011 -0700

    gui: Provide substitute for gtk_widget_get_realized() for GTK+ < 2.20.


This really needs to be used in a number of other places too.  So moving this
function somewhere else (probably helper.h) would be useful.

Similar wrapper functions that  we need include:

 gtk_widget_get_mapped 
 gtk_widget_get_visible
 gtk_widget_is_drawable 
 gtk_widget_has_focus 
 gtk_widget_set_can_focus


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