D25963: Avoid const references for return types

[Yuri Chornoivan]

yurchor created this revision.
yurchor added a reviewer: KDE Games.
Herald added a subscriber: kde-games-devel.
yurchor requested review of this revision.

REVISION SUMMARY
  Implement EBN recommendation
  
  http://ebn.kde.org/krazy/reports/kde-4.x/kdegames/libkdegames/index.html

TEST PLAN
  Compiles, installs, no visible changes in the KFourInLine chat dialog.

REPOSITORY
  R420 KDE Games Library

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D25963

AFFECTED FILES
  libkdegamesprivate/kchatbasemodel.cpp
  libkdegamesprivate/kchatbasemodel.h

To: yurchor, #kde_games
Cc: kde-games-devel
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