D16741: Remove potential endless loop from XClipboardSyncTest

graesslin created this revision.
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REVISION SUMMARY
  We need to wait till the helper process created the datadevice. For this
  we used a while loop. On build.kde.org the test gets stuck in this loop
  and times out after 10 minutes.
  
  This change introduces a dedicated signal and we just wait for it. So if
  something fails we wait only 5 sec instead of endless. This should help
  investigate why the test doesn't work on build.kde.org.

TEST PLAN
  Test works locally

REPOSITORY
  R108 KWin

BRANCH
  xclipboard-sync-no-endless-loop

REVISION DETAIL
  https://phabricator.kde.org/D16741

AFFECTED FILES
  autotests/integration/xclipboardsync_test.cpp
  wayland_server.cpp
  wayland_server.h

To: graesslin, #kwin
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart