D5046: UI feedback when checking for updates

[Dan Leinir Turthra Jensen]

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

REVISION SUMMARY
  This provides some very light user feedback when the update check has not been completed.  It ensures that we don't get told there are no updates, when we don't really know yet whether we really do.
  
  End result is that this patch sets the text "Checking for updates..." on the Update sidebar entry when we're fetching things.
  
  This also introduces a minor fix to the KNS backend, which on errors would otherwise end up in a perpetual fetching state.

REPOSITORY
  R134 Discover Software Store

REVISION DETAIL
  https://phabricator.kde.org/D5046

AFFECTED FILES
  discover/qml/DiscoverWindow.qml
  libdiscover/backends/KNSBackend/KNSBackend.cpp
  libdiscover/resources/ResourcesModel.cpp

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