Query lookup server

[tobiasKaminsky]

Query lookup search needs to be opt-in as it is now, but we should enhance the way:

Desktop it is not clearly visible how to do it

Discussed with @jancborchardt @nimisha-vijay

• show "search globally" as last search "result"
• after click on it
  • change "search globally" to "global search results"
  • append search results from lookup server
    • if none are found, show "no results found"

[allexzander]

@tobiasKaminsky So, do we need to have "Search globally" with a magnifying glass inside a background as the last completer list entry on the desktop, according to the second picture?

Note: QItemDelegate can be used to achieve that

[allexzander]

Likely, this needs inheriting the QCompleter and overriding some of its public methods (e.g. setPopup()).