D11868: Reduce interface stuttering

[Malte Veerman]

malteveerman created this revision.
malteveerman added a reviewer: Amarok.
malteveerman added a project: Amarok.
malteveerman requested review of this revision.

REVISION SUMMARY
  This reduces interface stuttering when playing new tracks or updating the collection. 
  I have about 9000 tracks on a NFS drive. Previously updating that folder let Amarok's interface hang for about 20 seconds. Now it just stutters a little bit.
  This <https://phabricator.kde.org/D11862> further improves the situation, because it makes the loading of lyrics async.

REPOSITORY
  R181 Amarok

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D11868

AFFECTED FILES
  src/EngineController.cpp
  src/context/applets/currenttrack/plugin/CurrentEngine.cpp
  src/core-impl/collections/db/sql/SqlScanResultProcessor.cpp
  src/core/meta/support/MetaUtility.cpp

To: malteveerman, #amarok
Cc: #amarok, jackyalcine, nhuisman, paul, yaohanchen, malteveerman, markey, cochise, tbettler, Smar, ricktimmis, asturmlechner, schweingruber, heikobecker
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