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The visibility toggling happening on ::click() relied implicitly on the popover animation, but breaks on disabled animations. The recursion happening within gtk_toggle_button_set_active() (which triggers ::clicked when changing state) makes this vfunc to run again, inverting the visibility of the popover in result. Fix this by explicitly checking about recursion, we want the button to be toggled to the right state, but we don't want the callback running again. https://bugzilla.gnome.org/show_bug.cgi?id=752577
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