D10105: baloo-widgets: Refactor filemetadataprovider for better readability

[Michael Heidelbach]

michaelh created this revision.
michaelh added reviewers: elvisangelaccio, ngraham, vhanda, smithjd, Dolphin, Frameworks.
michaelh requested review of this revision.

REVISION SUMMARY
  Prepare fixing bug 388583
  Make signal emission more obvious
  Make is easier to distinguish synchronous and asynchronous parts
  Apply some coding style rules
  
  CCBUG388583

TEST PLAN
  Visual inspection
  Make test

REPOSITORY
  R824 Baloo Widgets

BRANCH
  requestfinished (branched from master)

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

AFFECTED FILES
  src/filemetadataprovider.cpp
  src/filemetadataprovider.h

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