D20011: Be more precise with mimetype detection

[Alexander Stippich]

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

REVISION SUMMARY
  D18819 <https://phabricator.kde.org/D18819> changed the mimetype detection to content matching. However,
  this has side effects as the content matching algorithm quite often
  puts out ancestor mimetypes, in some case even "application/octet-stream".
  To solve this, query both extension and content mimetypes, and only
  use the file extension mimetype when the mimetype detected by file content
  is an ancestor, and use content mimetype when it isn't.
  This gives the precise mime type as before the change, but also prevents
  false detection only based on extension, which D18819 <https://phabricator.kde.org/D18819> tried to fix.

TEST PLAN
  unfortunately, no unit tests

REPOSITORY
  R293 Baloo

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D20011

AFFECTED FILES
  src/file/extractor/app.cpp

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