URL input fields becomes unresponsive while searching hints

[Flohack74]

Whenever I enter an URL in the top URL inout field I kinda feel blocked by the browser since it starts a search immediately and becomes unresponsive until the result with the hints is back. To solve this either:

• delay the start of the search until the user stopped typing a bit
  AND/OR
• search in a separate thread, that can be stopped/interrupted/restarted when new characters are entered by the user (again with some delay)
  The whole feature becomes pointless if I always have to wait until my 3 or 4 characters lead to a result I cannot use ;)

[balcy]

I've started prototyping for it a bit on https://github.com/ubports/morph-browser/tree/xenial_-_addressbartext

[UniversalSuperBox]

#365 would be a potential fix for this issue, and it tests fine. @Flohack74, does it fix the issue you were experiencing?

[Flohack74]

I will try!

[UniversalSuperBox]

@Flohack74, new ping. You brought this upon yourself by telling me to re-review all the old PRs :)