Protect views with no histories
svn: r15300
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@ -421,7 +421,8 @@ class DisplayState(gen.utils.Callback):
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the given handle.
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the given handle.
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"""
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"""
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history = self.get_history(nav_type, nav_group)
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history = self.get_history(nav_type, nav_group)
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history.push(handle)
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if history:
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history.push(handle)
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def set_sensitive(self, state):
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def set_sensitive(self, state):
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self.window.set_sensitive(state)
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self.window.set_sensitive(state)
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