D5446: Implement support for selected mime type filters

[Elvis Angelaccio]

elvisangelaccio created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  QFileDialog in Qt 5.9 has better support for mimetype filters and
  introduces the QFileDialog::selectedMimeTypeFilter() method [1].
  
  This change implements the required functions on the Plasma side. We
  cannot depend on Qt 5.9 yet, so the unit test will have an expected
  failure if we are building against Qt < 5.9.
  The manual test is also expanded.
  
  [1]: http://code.qt.io/cgit/qt/qtbase.git/commit/?h=5.9&id=34f82b8abcb279542b6350e70609c549e39caafb

TEST PLAN
  New unit tests pass when building against Qt >= 5.9.
  Manual test also works as expected.

REPOSITORY
  R135 Integration for Qt applications in Plasma

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D5446

AFFECTED FILES
  autotests/kfiledialog_unittest.cpp
  src/platformtheme/kdeplatformfiledialogbase_p.h
  src/platformtheme/kdeplatformfiledialoghelper.cpp
  src/platformtheme/kdeplatformfiledialoghelper.h
  src/platformtheme/kdirselectdialog.cpp
  src/platformtheme/kdirselectdialog_p.h
  tests/qfiledialogtest.cpp

To: elvisangelaccio, #plasma, dfaure
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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