QCompleterでLineEditに予測変換を入れる

class PopupSerchEdit(QDialog):

    send = Signal(str)

    def __init__(self, parent=None):
        super().__init__(parent)

        self.setWindowFlags(Qt.Popup)
        self.setAttribute(Qt.WA_TranslucentBackground)

        layout = QVBoxLayout(self)

        self.edit = QLineEdit(self)
        layout.addWidget(self.edit)
        self.setLayout(layout)
        # 現在のマウス位置にGUIを出す
        size_x = 200
        size_y = 50
        pos = QCursor().pos()
        self.setGeometry(pos.x() - size_x,
                         pos.y() - size_y,
                         size_x,
                         size_y)

        self.edit.returnPressed.connect(self.Submit)
        self.edit.setFocus()

        # SimpleなAutoCompleteを作る
        comp = QCompleter(self)
        comp.setModel(QStringListModel(['hogehoge', 'fugafuga', 'foo', 'bar']))
        # 全部表示: UnfilteredPopupCompletion
        # Inlineに候補を表示: InlineCompletion
        # POPUP表示: PopupCompletion
        comp.setCompletionMode(QCompleter.InlineCompletion)
        self.edit.setCompleter(comp)

    def Submit(self):
        # Enterしたら文字をEmitして閉じる
        self.send.emit(self.edit.text())
        self.close()

        # SimpleなAutoCompleteを作る
        comp = QCompleter(self)
        comp.setModel(QStringListModel(['hogehoge', 'fugafuga', 'foo', 'bar']))
        # 全部表示: UnfilteredPopupCompletion
        # Inlineに候補を表示: InlineCompletion
        # POPUP表示: PopupCompletion
        comp.setCompletionMode(QCompleter.UnfilteredPopupCompletion)
        self.edit.setCompleter(comp)

    def data(self, index, role):

        if not index.isValid():
            return None

        item = index.internalPointer()

        if role == Qt.DisplayRole:
            return item.data(index.column())
        if role == Qt.UserRole:
            return item
        if role == Qt.EditRole:
            return item.data(0)
        return None

class CustomQCompleter(QCompleter):
    def __init__(self, parent=None):
        super().__init__(parent=parent)
        self.setCompletionMode(self.PopupCompletion)
        self.setCaseSensitivity(Qt.CaseInsensitive)

    def setModel(self, model):
        self.srcModel = model
        self.proxyModel = QSortFilterProxyModel(self)
        self.proxyModel.setSourceModel(self.srcModel)
        super(CustomQCompleter, self).setModel(self.proxyModel)

    def splitPath(self, path):
        return re.sub("^/", "", path).split("/")

    def pathFromIndex(self, index):
        # SdfPatにに置き換える
        item = index.data(Qt.UserRole)
        return item.data(2)