[Qt-creator] Code assist API

[Christian Hönig]

Hi,

> we have recently reworked our code assist API. The main goal was to 
> allow the completion computation to run asynchronously so the GUI is not 
> blocked.
> 
> In general the behavior should remain the same, but there are some 
> slight changes. Pretty much all editors are affected, so if you notice 
> anything weird or malfunction please feel free to speak up.

I noticed a very positive change: completion for *one* subdirectory of our project didn't work yet ... now it works :-).

Thank you
Christian