QmlDesigner: Hide the filter widget for import in the ItemLibraryWidget

Change-Id: I3a7120793d3a6a34b45a22dbb25cf6a5381580e8
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>

src/plugins/qmldesigner/components/itemlibrary/itemlibrarywidget.cpp

@@ -287,6 +287,11 @@ void ItemLibraryWidget::emitImportChecked()
 
 void ItemLibraryWidget::setCurrentIndexOfStackedWidget(int index)
 {
+    if (index == 2)
+        m_filterLineEdit->setVisible(false);
+    else
+        m_filterLineEdit->setVisible(true);
+
     m_stackedWidget->setCurrentIndex(index);
 }