D18813: Filter out invalid content in lists

[Dan Leinir Turthra Jensen]

leinir created this revision.
leinir added a reviewer: KNewStuff.
leinir added a project: KNewStuff.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
leinir requested review of this revision.

REVISION SUMMARY
  Prior to this change, if the ocs server being queried returned a list of entries containing invalid entries (such as happened a few days ago for the otherwise empty Akonadi email providers category), the listing function would faithfully return that list of entries verbatim, which led consumers of that list to insist there were more entries to fetch, and then try again, and again, and again. With this patch, only valid entries get forwarded as results to the consumers (be they knewstuff's own dialogues, or others, such as Discover or Peruse).
  
  This change is in KNewStuff rather than Attica, because Attica by design does not apply heuristics of any sort to its functions. That, again by design, is what KNewStuff is for.

REPOSITORY
  R304 KNewStuff

REVISION DETAIL
  https://phabricator.kde.org/D18813

AFFECTED FILES
  src/attica/atticaprovider.cpp

To: leinir, #knewstuff
Cc: kde-frameworks-devel, michaelh, ZrenBot, ngraham, bruns
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