qml: add flickable to exceptiondialog

electrum/gui/qml/components/ExceptionDialog.qml

@@ -54,6 +54,7 @@ ElDialog
             Layout.alignment: Qt.AlignCenter
             text: qsTr('Show report contents')
             onClicked: {
+                if (crashData.traceback)
                     console.log('traceback: ' + crashData.traceback.stack)
                 var dialog = report.createObject(app, {
                     reportText: crashData.reportstring
@@ -123,13 +124,20 @@ ElDialog
 
             header: null
 
+            Flickable {
+                anchors.fill: parent
+                contentHeight: reportLabel.implicitHeight
+                interactive: height < contentHeight
+
                 Label {
+                    id: reportLabel
                     text: reportText
                     wrapMode: Text.Wrap
                     width: parent.width
                 }
             }
         }
+    }
 
     Connections {
         target: AppController