Iain Lane authored May 08, 2017 and Richard Hughes committed May 09, 2017

If there are several results for the same app from the 'same place' -
for example a distro package has an update the user hasn't yet installed
- only show one result in the search results list.

Do this by filtering on id/source/version, which should be stable across
updates ('version' is the installed version if the app is installed
[regardless of available updates] or the candidate version if not).

https://bugzilla.gnome.org/show_bug.cgi?id=782340