1)event signal, 2)focus move

Title: Message
two questions,
1)why emit an "event" signal before emit the TRUE sigal in gtk_widget_event_internal
2)i'm lost when trace focus moving with "tab" key in GtkWindow.
    what i can see are
    a) in gtk_window_class_init, "tab" is binding to function add_tab_bindings
    b) in add_tab_bindings, "tab" is connected with singal "move_focus" which will trigger gtk_window_move_focus
    what i can not see are
    a) how a key press event is connected with key binding
    b) how a GtkWindow widget move focus among its children
thanks in advance for your help,

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