add filter to object inspector

Problem: for complex forms it takes quite some time to try to find a specific widget in object inspector (esp. that the list has indentations/tree structure and you see there also layouts, spacers etc.; and the list may be very long).

Suggestion: it would be really great if object inspector in designer had a filter on object name, e.g. similar to the filter on property name in property editor.

(low prio, but would be very handy and maybe it's simple to implement by just copying the code from the property editor? ).