Object Hierarchy

    GObject
        GtkTextBuffer
            GtkSourceBuffer
        GInitiallyUnowned
            GtkSourceCompletionContext
            GtkWidget
                GtkContainer
                    GtkBin
                        GtkWindow
                            GtkSourceCompletionInfo
                    GtkTextView
                        GtkSourceView
            GtkSourceGutterRenderer
                GtkSourceGutterRendererPixbuf
                GtkSourceGutterRendererText
        GtkSourceCompletion
        GtkSourceCompletionItem
        GtkSourceCompletionWords
        GtkSourceGutter
        GtkSourceLanguage
        GtkSourceLanguageManager
        GtkSourceMarkAttributes
        GtkTextMark
            GtkSourceMark
        GtkSourcePrintCompositor
        GtkSourceStyle
        GtkSourceStyleScheme
        GtkSourceStyleSchemeManager
    GInterface
        GtkSourceCompletionProposal
        GtkSourceCompletionProvider
        GtkSourceUndoManager