FindToolBar: Add support for "lightcolored" panels

The labels need to be polished so that they get the right palette,
and the icon needs to be switched from light to dark.

Change-Id: I3e37947e741c3d92f3c1ac3bb02e631aa7803f59
Reviewed-by: Eike Ziller <eike.ziller@digia.com>

src/plugins/classview/classviewnavigationwidget.cpp

@@ -99,7 +99,8 @@ NavigationWidget::NavigationWidget(QWidget *parent) :
     treeView = new ::Utils::NavigationTreeView(this);
     treeView->setEditTriggers(QAbstractItemView::NoEditTriggers);
     verticalLayout->addWidget(Core::ItemViewFind::createSearchableWrapper(
-                              treeView, Core::ItemViewFind::FetchMoreWhileSearching));
+                                  treeView, Core::ItemViewFind::DarkColored,
+                                  Core::ItemViewFind::FetchMoreWhileSearching));
 
     // tree model
     treeModel = new TreeItemModel(this);