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:map-event is ugly IMO, because it's a mere implementation detail at best. Doing it properly would be listening to GtkMenuToolButton::show-menu. However, just like GtkWidget::show on the menu itself, it somehow is emitted twice under GTK >= 3.16. See the just-filed bug.
I'm not sure what to do. This is clearly a GTK bug, so I'm not very keen on adding a hack just for it until it gets fixed.
IIUC "show" is called everytime one calls gtk_widget_show() which can be more than once?
No, it's only emitted if the visible state changed. What happens here is that the menu is effectively shown twice.
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