D10105: baloo-widgets: Refactor filemetadataprovider for better readability

[Michael Heidelbach]

michaelh added a dependency: D10143: baloo-widgets: Apply coding style to filemetadataprovider .

REPOSITORY
  R824 Baloo Widgets

REVISION DETAIL
  https://phabricator.kde.org/D10105

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