D22764: Stabilize test KFileWidgetTest::testDropFile

[Méven Car]

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

REVISION SUMMARY
  The test introduced in D20838 <https://phabricator.kde.org/D20838> was not completely stable.
  It causes failures on CI :
  
  https://build.kde.org/job/Frameworks/view/Platform%20-%20SUSEQt5.12/job/kio/job/kf5-qt5%20SUSEQt5.12/139/testReport/junit/projectroot/autotests/kiofilewidgets_kfilewidgettest/
  https://build.kde.org/job/Frameworks/view/Platform%20-%20SUSEQt5.13/job/kio/job/kf5-qt5%20SUSEQt5.13/7/testReport/projectroot/autotests/kiofilewidgets_kfilewidgettest/
  
  This patch replaces a wait by an appropriate QSignalSpy.

TEST PLAN
  LANG ctest -R kiofilewidgets

REPOSITORY
  R241 KIO

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D22764

AFFECTED FILES
  autotests/kfilewidgettest.cpp

To: meven, dfaure
Cc: kde-frameworks-devel, LeGast00n, sbergeron, michaelh, ngraham, bruns
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