QmlDesigner: Disable Timeview and CurveEditorView when widget is invisble

Task-number: QDS-5159
Change-Id: Ibae0b9742d4aaac6a1def1c84342a031baf75256
Reviewed-by: Knud Dollereder <knud.dollereder@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/plugins/qmldesigner/components/curveeditor/curveeditor.cpp

@@ -81,6 +81,18 @@ void CurveEditor::clearCanvas()
     m_view->reset({});
 }
 
+void CurveEditor::showEvent(QShowEvent *event)
+{
+    emit viewEnabledChanged(true);
+    QWidget::showEvent(event);
+}
+
+void CurveEditor::hideEvent(QHideEvent *event)
+{
+    emit viewEnabledChanged(false);
+    QWidget::hideEvent(event);
+}
+
 QToolBar *CurveEditor::createToolBar(CurveEditorModel *model)
 {
     auto *bar = new QToolBar;