Application launcher doesnt wait for search to update before launching

## Problem
I use App launcher often to open apps, and type quite fast so it is pretty common that I type lets say "vlc" to open VLC, and hit enter immediately. But launcher opens VirtualBox because there are search results for "v" are still in the window, not for "vlc".

## Proposal
The proposal is to let launcher complete all the search routine before applying "enter" hit to the results. Thats what Mac OS does by default with Spotlight I believe and its how it should work on elementary.