c_gtk_widget_add_accelerator

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GtkWidget* widget, gchar* accelSignal, GtkAccelGroup* accelGroup, guint accelKey, GdkModifierType accelMods, GtkAccelFlags accelFlags) c_gtk_widget_add_accelerator;

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