D15072: [server] Abort drag start on correct conditions and without posting error

[David Edmundson]

davidedmundson accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R127 KWayland

BRANCH
  startDragAbortFix

REVISION DETAIL
  https://phabricator.kde.org/D15072

To: romangg, #kwin, davidedmundson
Cc: adridg, kde-frameworks-devel, michaelh, ngraham, bruns