GDK_CONTROL_MASK |
GDK_SHIFT_MASK | GDK_MOD1_MASK | GDK_SUPER_MASK |
GDK_HYPER_MASK | GDK_META_MASK, that is, Control, Shift, Alt,
Super, Hyper and Meta. Other modifiers will by default be ignored
by GtkAccelGroup.
You must include at least the three modifiers Control, Shift
and Alt in any value you pass to this function.gtkAcceleratorSetDefaultModMask(default.mod.mask)default.mod.mask