D6299: create shell surface only at the right moment

[Marco Martin]

mart created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  make the behavior similar to Dialog
  create a plasmashell surface only when isVisible() as
  some expose events can arrive there too, and also not
  create the shell surface if the exposed surface is null

TEST PLAN
  krunner seems to be more reliable

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6299

AFFECTED FILES
  krunner/view.cpp

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