D13814: Speedup sort

[Jaime Torres Amate]

jtamate created this revision.
jtamate added reviewers: Dolphin, Frameworks.
Restricted Application added a project: Dolphin.
Restricted Application added a subscriber: kfm-devel.
jtamate requested review of this revision.

REVISION SUMMARY
  Use a lambda function instead of a class.
  This way the member QCollator is not copied and initialized several times.

TEST PLAN
  Sorting in a directory with 82874 images:
  [TIME] Sorting: 19883  (before)
  [TIME] Sorting: 4198 (after)
  
  kfileitemmodelbenchmark before: ..............   Passed   29.36 sec
  kfileitemmodelbenchmark after:    ..............   Passed   20.39 sec

REPOSITORY
  R318 Dolphin

REVISION DETAIL
  https://phabricator.kde.org/D13814

AFFECTED FILES
  src/kitemviews/kfileitemmodel.cpp

To: jtamate, #dolphin, #frameworks
Cc: kfm-devel, spoorun, navarromorales, isidorov, firef, andrebarros, emmanuelp
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