CppEditor: Fix target of symbol drop-down

It was jumping to the symbol location in the active editor instead of
the editor for the combo box.

Task-number: QTCREATORBUG-11157
Change-Id: Ic261f2dd214c15ff41c8342a6ef72626b7db0f86
Reviewed-by: David Schulz <david.schulz@digia.com>

src/plugins/cppeditor/cppeditor.cpp

@@ -1046,7 +1046,9 @@ void CPPEditorWidget::jumpToOutlineElement(int index)
     if (!symbol)
         return;
 
-    openCppEditorAt(linkToSymbol(symbol));
+    const Link &link = linkToSymbol(symbol);
+    gotoLine(link.targetLine, link.targetColumn);
+    Core::EditorManager::activateEditor(editor());
 }
 
 void CPPEditorWidget::setSortedOutline(bool sort)