D5323: Correctly handle when a new primary screen displaces the old

[Marco Martin]

mart edited the summary of this revision.
mart edited the test plan for this revision.

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D5323

To: mart, #plasma, broulik, sebas
Cc: plasma-devel, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, 
sebas, apol