Filter value typed while loading get discarded once result is loaded

[ThieryMichel]

On big list (slow network) if you type in a text filter, triggering a search (stop typing for 0.5ms triggering the search) then type again, the new typed letter get discarded when the search result is loaded.

Steps to Reproduce

Here is a plunker where I added a delay on http response and a filter on users : http://plnkr.co/edit/8vHRpJOcFufUDR2HkvDU?p=preview

To reproduce simply type a search. Wait a little for the spinner to appear. Type again, when the result get loaded, what you typed got discarded.