c_gtk_accel_group_activate

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)
int function(GtkAccelGroup* accelGroup, GQuark accelQuark, GObject* acceleratable, uint accelKey, GdkModifierType accelMods) c_gtk_accel_group_activate;

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