Emitted when a context menu for the label is popped up.
A context menu will normally be popped up when a user right clicks on a
selectable label. When this signal is emitted, the context menu is passed
to the callback.
This signal cannot be emitted unless the label has been made selectable by
passing true to set_selectable() , because text that is not
selectable will not have a context menu.
void callback(GtkLabel label
, GtkMenu popup
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