I looked how it can happen. So you have start ide or open new project. The scanning was started and during the scanning you have called js code completion. So the code completion displayed "Scanning in progress...". When the scan was finished, computing cc items started, but the infrastructure still displays message that scanning is still in progress. 

The js code completion had to be called for the first time for the used userdir or NB could not download the documentation before. Computing Js items asks for the global objects from implemented js frameworks. For creating global angular object, the NetBeans has to download Angular documentation. Unfortunately is done in the same thread as are counted the cc items. The downloaded documentation is cached in ${userdir}/var/ajs-doc. When the download is finished the global angular global is created. The global object is static so is created only once per ide session. If there is already cached the documentation, then is created quickly from the cache, if not, then the documentation is trying to be downloaded and the process is waiting until download is finished.

How it is written now, it doesn't depend, whether angular is used. One of the solution, which I have in my mind, is to create a fake empty angular global object and downloading the documentation separate in a new process and when the documentation will be downloaded, then alter the angular global object. Probably it means that code completion result will not offer the angular properties until the download is finished.

Fixed in web-main.