D10113: Emit metaDataRequestFinished once per request

[Michael Heidelbach]

michaelh added a dependency: D10105: baloo-widgets: Refactor filemetadataprovider for better readability.

REPOSITORY
  R824 Baloo Widgets

REVISION DETAIL
  https://phabricator.kde.org/D10113

To: michaelh, elvisangelaccio, smithjd, vhanda, ngraham, #dolphin, #frameworks
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