Launchpad Search: search only when nothing is found

[sergeibbb]

This issue is a follow-up of #3543

The problem

• Users starts searching in the Launchpad
• Some items that are presented become visible immediately
• But after a second or two API search finishes and its result appear so the initial items stops being visible.

That's because we cannot control order of items in the quickpick when it's in the search/filtering state.

The solution

Search only when nothing is found locally.

[sergeibbb]

Hi @eamodio

In main I see changes related to this: that implement manual trigger to search. Should this ticket have been closed as cancelled?

cc @justinrobots

[eamodio]

Yeah this can be closed as complete.