D27731: Improve KDirModel to avoid showing '+' if there are no subdirs

[Méven Car]

meven added a comment.


  I believe this causes https://bugs.kde.org/show_bug.cgi?id=419434
  It causes similar issue with dolphin and KFileWidget
  
  This is not a correct behavior.
  It prevents file treeview to show files within folders with no subfolders.
  The bug has a proposed patch :
  https://bugsfiles.kde.org/attachment.cgi?id=128272
  
  I think this needs to be reverted or at least reworked.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D27731

To: dfaure, apol, ahmadsamir, meven, rrosch
Cc: kde-frameworks-devel, LeGast00n, cblack, michaelh, ngraham, bruns
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