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/cppeditor/cppincludehierarchy.cpp

@@ -116,7 +116,9 @@ CppIncludeHierarchyWidget::CppIncludeHierarchyWidget() :
     layout->setSpacing(0);
     layout->addWidget(m_inspectedFile);
     layout->addWidget(Core::ItemViewFind::createSearchableWrapper(
-                          m_treeView, Core::ItemViewFind::FetchMoreWhileSearching));
+                          m_treeView,
+                          Core::ItemViewFind::DarkColored,
+                          Core::ItemViewFind::FetchMoreWhileSearching));
     layout->addWidget(m_includeHierarchyInfoLabel);
     setLayout(layout);