D20045: Add helper function to determine mime type based on content and extension

[Stefan Brüns]

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

REVISION SUMMARY
  The QMimeDatabase::MatchDefault only falls back to content matching
  if the extension is not known. This fails for e.g. Matroska files, where
  the content allows to distinguish between audio and video files.
  
  CCBUG: 403902

REPOSITORY
  R286 KFileMetaData

BRANCH
  submit_mime

REVISION DETAIL
  https://phabricator.kde.org/D20045

AFFECTED FILES
  src/CMakeLists.txt
  src/mimeutils.cpp
  src/mimeutils.h

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