D8946: Avoid unnecessary 'dataChanged' signal

[Renato Oliveira Filho]

renatoo created this revision.
Restricted Application added a project: Frameworks.
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REVISION SUMMARY
  Only emit 'dataChanged' signal if the data really changes

TEST PLAN
  Unit test created

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D8946

AFFECTED FILES
  autotests/kfileplacesmodeltest.cpp
  src/filewidgets/kfileplacesmodel.cpp

To: renatoo
Cc: #frameworks
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