LocatorWidget: Fix hover effect

..by setting Qt::WA_Hover

Change-Id: If4b6e8d443a70e18796dd78b261495f2400db0f4
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>
Reviewed-by: Alessandro Portale <alessandro.portale@theqtcompany.com>

src/plugins/coreplugin/locator/locatorwidget.cpp

@@ -233,6 +233,7 @@ LocatorWidget::LocatorWidget(Locator *qop) :
     // Explicitly hide the completion list popup.
     m_completionList->hide();
 
+    setAttribute(Qt::WA_Hover);
     setFocusProxy(m_fileLineEdit);
     setWindowTitle(tr("Locate..."));
     resize(200, 90);