D5145: Mark "all categories missing" kns sources as invalid

[Dan Leinir Turthra Jensen]

leinir created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  KNS being, at times, a little twitchy means that we have to handle
  such things a bit more gracefully. As such, without this code,
  the KNS backend would remain in a perpetial search state after
  startup, which would result in inconsistencies.
  
  Implement UI feedback for long-running searches, and no-results
  
  If a search takes longer than a couple of seconds, a spinner
  will face-and-slide in from the bottom of the view. If it then
  takes a while longer, a text saying "Still looking" will fade in
  very slowly. If the search is near-instant (the general case),
  the spinner does not show up.

REPOSITORY
  R134 Discover Software Store

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5145

AFFECTED FILES
  discover/qml/ApplicationsListPage.qml
  libdiscover/backends/KNSBackend/KNSBackend.cpp

To: leinir
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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