OutlineViews: Make behavior consistent with other views

Allow them to be focused, activate also on return/enter. Also fix focus
handling so that assigning a shortcut to "Activate Outline View"
actually
works.

Change-Id: I878777ae0dad493af1715b36ee264a4f0c12443e
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/qmljseditor/qmljsoutlinetreeview.cpp

@@ -39,8 +39,6 @@ namespace Internal {
 QmlJSOutlineTreeView::QmlJSOutlineTreeView(QWidget *parent) :
     Utils::NavigationTreeView(parent)
 {
-    // see also CppOutlineTreeView
-    setFocusPolicy(Qt::NoFocus);
     setExpandsOnDoubleClick(false);
 
     setDragEnabled(true);