D23454: Fixing bug where MTP slave does not return error in stat()/mimetype()

[Alexander Saoutkin]

feverfew created this revision.
feverfew added reviewers: chinmoyr, akrutzler, elvisangelaccio, dfaure.
Herald added projects: Dolphin, Frameworks.
Herald added subscribers: kfm-devel, kde-frameworks-devel.
feverfew requested review of this revision.

REVISION SUMMARY
  This patch fixes two cases where invalid KTMPFile objects would be treated as 
  valid. In particular, this would manifest in KIO::stat() and KIO::mimetype() 
  returning without error when they, in fact, should do. One would note that in 
  the rest of the code, KMTPFile objects that are received via 
  KMTPStorageInterface::getFileMetaData() always have a isValid() check applied 
  before use. The two previously mentioned functions, incorrectly, do not have 
  this check applied. This patch simply adds these necessary checks.

TEST PLAN
  KIOFuse uses KIO::stat() to complete a lookup. Before this patch lookup would
  always succeed and this was determined to be because stat would always succeed.
  This bug could be easily found as tab completion would never work correctly. 
  Trying to tab complete would seem to add what was already typed in to the 
  directory. With this patch applied, lookup no longer always succeeds and tab 
  completion now works.

REPOSITORY
  R320 KIO Extras

BRANCH
  mtpFixStat (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D23454

AFFECTED FILES
  mtp/kio_mtp.cpp

To: feverfew, chinmoyr, akrutzler, elvisangelaccio, dfaure
Cc: kde-frameworks-devel, kfm-devel, fvogt, aprcela, vmarinescu, fprice, LeGast00n, MrPepe, fbampaloukas, alexde, GB_2, Codezela, feverfew, meven, michaelh, spoorun, navarromorales, firef, ngraham, andrebarros, bruns, emmanuelp, mikesomov
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