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

[David Faure]

dfaure created this revision.
dfaure added reviewers: apol, ahmadsamir, meven.
Herald added a project: Frameworks.
Herald added a subscriber: kde-frameworks-devel.
dfaure requested review of this revision.

REVISION SUMMARY
  We either have the information at hand (in populated dirs)
  or we query the filesystem (in non-populated dirs).

TEST PLAN
  Tested by Raphael Rosch in D25315 <https://phabricator.kde.org/D25315>

REPOSITORY
  R241 KIO

BRANCH
  master

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

AFFECTED FILES
  src/widgets/kdirmodel.cpp

To: dfaure, apol, ahmadsamir, meven
Cc: kde-frameworks-devel, LeGast00n, cblack, GB_2, michaelh, ngraham, bruns
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