如何同时使用客户FilterProxyModel和QtCore.Qt.EditRole？

from PyQt5.QtCore import QSortFilterProxyModel, Qt
from PyQt5.QtGui import QStandardItemModel
from PyQt5.QtWidgets import QApplication, QListView

class SourceModel(QStandardItemModel):
    def __init__(self, data):
        super().__init__()
        self.data = data

    def rowCount(self, parent):
        return len(self.data)

    def columnCount(self, parent):
        return 1

    def data(self, index, role):
        if role == Qt.DisplayRole or role == Qt.EditRole:
            return self.data[index.row()]
        return None

app = QApplication([])

data = ['apple', 'banana', 'cherry', 'date', 'elderberry']
source_model = SourceModel(data)

proxy_model = QSortFilterProxyModel()
proxy_model.setSourceModel(source_model)
proxy_model.setFilterRegExp('a')
proxy_model.setFilterKeyColumn(0)

list_view = QListView()
list_view.setModel(proxy_model)

list_view.show()
app.exec_()