D10149: baloo-widgets: Add autotest for asychronously extracted data

[Michael Heidelbach]

michaelh added a comment.


  We are doing to many things at once here. I suggest to split this diff.
  
  1. Remove dataavailable signal (affected: `FileMetaDataWidget` and `FileMetaDataProvider`)
  2. Use object names (affected: `FileMetaDataWidget` and `WidgetFactory`)
  3. Base this diff on 1) and 2)
  
  But first the tests have to pass for you too.

REPOSITORY
  R824 Baloo Widgets

REVISION DETAIL
  https://phabricator.kde.org/D10149

To: michaelh, #dolphin, elvisangelaccio
Cc: ngraham, ashaposhnikov, spoorun, nicolasfella, alexeymin
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