qml: make sure to keep ref to instance

electrum/gui/qml/components/ChannelBackups.qml

@@ -54,7 +54,7 @@ Pane {
                     Layout.preferredWidth: parent.width
                     Layout.fillHeight: true
                     clip: true
-                    model: Daemon.currentWallet.channelModel.filterModel('is_backup', true)
+                    model: Daemon.currentWallet.channelModel.filterModelBackups()
 
                     delegate: ChannelDelegate {
                         onClicked: {

electrum/gui/qml/components/Channels.qml

@@ -78,7 +78,7 @@ Pane {
                     Layout.preferredWidth: parent.width
                     Layout.fillHeight: true
                     clip: true
-                    model: Daemon.currentWallet.channelModel.filterModel('is_backup', false)
+                    model: Daemon.currentWallet.channelModel.filterModelNoBackups()
 
                     delegate: ChannelDelegate {
                         onClicked: {

electrum/gui/qml/qechannellistmodel.py

@@ -169,11 +169,20 @@ class QEChannelListModel(QAbstractListModel, QtEventListener):
                 return
             i = i + 1
 
-    @pyqtSlot(str, 'QVariant', result=QEFilterProxyModel)
     def filterModel(self, role, match):
-        self._filterModel = QEFilterProxyModel(self, self)
+        _filterModel = QEFilterProxyModel(self, self)
         assert role in self._ROLE_RMAP
-        self._filterModel.setFilterRole(self._ROLE_RMAP[role])
-        self._filterModel.setFilterValue(match)
-        return self._filterModel
+        _filterModel.setFilterRole(self._ROLE_RMAP[role])
+        _filterModel.setFilterValue(match)
+        return _filterModel
+
+    @pyqtSlot(result=QEFilterProxyModel)
+    def filterModelBackups(self):
+        self._fm_backups = self.filterModel('is_backup', True)
+        return self._fm_backups
+
+    @pyqtSlot(result=QEFilterProxyModel)
+    def filterModelNoBackups(self):
+        self._fm_nobackups = self.filterModel('is_backup', False)
+        return self._fm_nobackups
 

electrum/gui/qml/qemodelfilter.py

@@ -5,10 +5,9 @@ from electrum.logging import get_logger
 class QEFilterProxyModel(QSortFilterProxyModel):
     _logger = get_logger(__name__)
 
-    _filter_value = None
-
     def __init__(self, parent_model, parent=None):
         super().__init__(parent)
+        self._filter_value = None
         self.setSourceModel(parent_model)
 
     countChanged = pyqtSignal()