D8526: add a background in ScrollView

[Marco Martin]

mart created this revision.
mart added a reviewer: Plasma.
Restricted Application added a project: Plasma.
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REVISION SUMMARY
  add a background in scrollview similar to what qwidget's scrollviews do
  hide it by default since is not something that seems much in line with qqc2
  
  the api to show it would be scrollview.background.visible = true
  
  which is not really public/nice but it would work without adding extra api

TEST PLAN
  tested with the new design of qml kcms

REPOSITORY
  R858 Qt Quick Controls 2: Desktop Style

BRANCH
  phab/background

REVISION DETAIL
  https://phabricator.kde.org/D8526

AFFECTED FILES
  org.kde.desktop/ScrollView.qml

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