D20138: Add a helper to determine actual supported parent mime type

[Stefan Brüns]

bruns created this revision.
bruns added reviewers: Baloo, Frameworks, ngraham, astippich.
Herald added projects: Frameworks, Baloo.
Herald added a subscriber: kde-frameworks-devel.
bruns requested review of this revision.

REVISION SUMMARY
  The ExtractorCollection::fetchExtractors method falls back to ancestor
  mime types in case a type is not supported directly. For most extractors
  this is no problem, as these ignore the passed in mime type and rely
  on the backing library to figure out the type, while the taglibextractor
  requires one of the supported (container) types.
  
  For most cases the input type is returned, but it falls back to
  inheritance, matching the logic from ExtractorCollection::fetchExtractors.

REPOSITORY
  R286 KFileMetaData

BRANCH
  submit2

REVISION DETAIL
  https://phabricator.kde.org/D20138

AFFECTED FILES
  src/extractionresult.h
  src/extractorplugin.cpp
  src/extractorplugin.h

To: bruns, #baloo, #frameworks, ngraham, astippich
Cc: kde-frameworks-devel, gennad, domson, ashaposhnikov, michaelh, astippich, spoorun, ngraham, bruns, abrahams
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