Find "C++ Symbols" shows not matching results

To reproduce:
1. Load Creator project
2. Open Search pane (Ctrl + Shift + F)
3. Scope: "C++ Symbols"
4. Search for: "set"
5. Press "Search"

Inside the results list you may see e.g. "Utils::BaseTreeView::resizeColumns()", which doesn't match the "set" input.

Correction: literally it matches the class name: Ba[SET]reeView, but showing all the not matching methods of this class doesn't really make sense. Most probably it should show only c'tor and d'tor of this class in this case .