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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
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