Code review comment for lp:~gary-wzl77/unity-scopes-shell/fix_1576311

> Actually, we need to trigger this signal.
> I take unity-scope-tool for example.
> If we don't emit searchQueryChanged() signal in following case
> 1.query sth by typing some keywords
> 2.click 'Cancel'
> The textedit of search query will not be updated, which should be cleared up
> after a query is cancelled.

Ah, ok, that's interesting. Anyway, this is looking good, no issues spotted in my testing. Thanks!