D9508: List known updates on startup

[Fabian Vogt]

fvogt created this revision.
fvogt added reviewers: lukas, jgrulich.

REVISION SUMMARY
  Currently it's possible that it just says "No updates available" although
  PackageKit knows the opposite. This is because it doesn't even ask PK on
  startup. With this, it always lists available updates, only refreshing
  the cache if necessary.

TEST PLAN
  Ran plasmoidviewer, now lists available updates instead of
  "Your system is up to date".

REPOSITORY
  R623 Plasma PackageKit Updater

BRANCH
  fixes

REVISION DETAIL
  https://phabricator.kde.org/D9508

AFFECTED FILES
  src/plasma/contents/ui/main.qml

To: fvogt, lukas, jgrulich
Cc: plasma-devel
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