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GObject ├── EComposerHeader │ ├── EComposerFromHeader │ ├── EComposerNameHeader │ ╰── EComposerTextHeader │ ├── EComposerPostHeader │ ╰── EComposerSpellHeader ╰── GInitiallyUnowned ╰── GtkWidget ╰── GtkContainer ├── GtkTable │ ╰── EComposerHeaderTable ╰── GtkBin ╰── GtkWindow ╰── EMsgComposer