other uses of self.uistate are protected and this one should be too
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@ -488,7 +488,9 @@ class ManagedWindow:
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self.window.set_modal(True)
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# The following makes sure that we only have one modal window open;
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# if more the older ones get temporarily made non-modal.
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self.other_modal_window = self.uistate.gwm.find_modal_window(window)
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if self.uistate:
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self.other_modal_window = self.uistate.gwm.find_modal_window(
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window)
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if self.other_modal_window:
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self.other_modal_window.set_modal(False)
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self.window.set_modal(True)
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