QmlDesigner: Support aliases in Connection View

- Allows user to select aliases in connections view
 - Seeks signals for aliases

Task: QDS-2411

Change-Id: I69eb875eb99cbf8cd6a842d5f7e166d9990bb255
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

src/plugins/qmldesigner/components/connectioneditor/connectionviewwidget.cpp

@@ -161,7 +161,7 @@ void ConnectionViewWidget::contextMenuEvent(QContextMenuEvent *event)
 
             menu.addAction(tr("Open Connection Editor"), [&]() {
                 if (index.isValid()) {
-                    m_connectonEditor->showWidget(mapToGlobal(event->pos()).x(), mapToGlobal(event->pos()).y());
+                    m_connectonEditor->showWidget();
                     m_connectonEditor->setBindingValue(index.data().toString());
                     m_connectonEditor->setModelIndex(index);
                     m_connectonEditor->updateWindowName();