D10722: other preload microoptimizations

[Marco Martin]

mart created this revision.
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REVISION SUMMARY
  make svgitem schedule a polish right when it's done loading
  
  ScrollView now forces to layout items as soon is created, to preload items
  before the window is shown
  
  remove useless include

TEST PLAN
  possible to preload (almost) the whole systray with less hacks
  on that part (see D10692 <https://phabricator.kde.org/D10692>)

REPOSITORY
  R242 Plasma Framework (Library)

BRANCH
  phab/preloadmicropts

REVISION DETAIL
  https://phabricator.kde.org/D10722

AFFECTED FILES
  src/declarativeimports/core/iconitem.h
  src/declarativeimports/core/svgitem.cpp
  src/declarativeimports/core/svgitem.h
  src/declarativeimports/plasmaextracomponents/qml/ScrollArea.qml

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