D10681: preload the expander (the dialog) too

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  when preloading, preload the expander as well, and reparent the
  full representation to it, so we have a scene schanged less.
  also do a create() of that window (may be worth to do create()
  automatically in every Dialog?)

TEST PLAN
  the first open is visibly a lot faster now

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/preload

REVISION DETAIL
  https://phabricator.kde.org/D10681

AFFECTED FILES
  src/plasmaquick/appletquickitem.cpp
  src/plasmaquick/private/appletquickitem_p.h

To: mart, #plasma
Cc: plasma-devel, #frameworks, michaelh, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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