This bug was fixed in the package appstream-glib - 0.5.13-1ubuntu2
---------------
appstream-glib (0.5.13-1ubuntu2) xenial; urgency=medium
* Do not load stock icons from the metadata. This is needed to not
trigger a bug in GNOME Software which can not be fixed easily
in Xenial. This will resolve the regression described in LP: #1576780
-- Matthias Klumpp <m...@debian.org> Fri, 10 Jun 2016 18:02:34 +0200
** Changed in: appstream-glib (Ubuntu Xenial)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1576780
Title:
Needs to implement the full DEP-11 icon spec for compatibility with
3rd-party repos
Status in appstream-glib package in Ubuntu:
Fix Released
Status in appstream-glib source package in Xenial:
Fix Released
Bug description:
[Impact]
* The AppStream YAML spec describes a way to include width/height properties
in cached-icon metadata, which isn't forward-compatible to the old spec.
* asglib doesn't implement the full spec in the release present in Xenial,
so it ignores cached icons with size info, as well as it doesn't support
several features present in the spec, e.g. the remote icon type.
* This leads to AppStream components from 3rd-party repos/PPAs not showing
up in GNOME Software, since asglib is unable to find icons if they use a more
recent version of the spec.
* The attched patch fixes this.
[Test Case 1]
* Close all instances of GNOME Software (also the background daemon!)
* Launch GNOME Software again: All apps should be present, you should notice
no change.
[Test Case 2]
* Close all instances of GNOME Software (also the background daemon!)
* Get new-style metadata, e.g. from Elementary or Debian[1], or simply add
the SIL repo which is shipping that metadata now: http://packages.sil.org/
(that would be the easiest way to test)
* Launch GNOME Software again: All apps should be present, including the
3rd-party ones (search for "FieldWorks").
[1]: ftp://ftp.debian.org/debian/dists/stretch/main/dep11/
[Regression Potential]
* This is adding a missing feature, restoring compatibility with 3rd-
party repos. The existing data should be parsed as before, so I don't
see much regression potential ("Test Case 1" needs to work)
[Other Info]
* This fix has been applied upstream:
https://github.com/hughsie/appstream-glib/commit/628e3cfb1c62c3177d6decd86102217f2546e0a2
* The fix is also present in Debian.
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