[Differential] [Request, 129 lines] D3532: Select correct index without timer

[mart (Marco Martin)]

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

REVISION SUMMARY
  select the correct index upon loading when the count changes.
  this removes the flicker at startup and the view is at the correct
  wallpaper since the first frame. Also, now when a wallpaper is
  downloaded with knewstuff, the old wallpaper stays selected,
  it doesn't get resetted to the first wallpaper anymore

TEST PLAN
  open wallpaer dialog, no more flicker
  install a new wallpaper, the currently selected one stays selected

REPOSITORY
  R120 Plasma Workspace

BRANCH
  phab/wallpselectedindex

REVISION DETAIL
  https://phabricator.kde.org/D3532

AFFECTED FILES
  wallpapers/image/backgroundlistmodel.cpp
  wallpapers/image/backgroundlistmodel.h
  wallpapers/image/imagepackage/contents/ui/WallpaperDelegate.qml
  wallpapers/image/imagepackage/contents/ui/config.qml
  wallpapers/image/imagepackage/platformcontents/phone/ui/WallpaperDelegate.qml
  wallpapers/image/imagepackage/platformcontents/phone/ui/config.qml
  wallpapers/image/imagepackage/platformcontents/touch/ui/WallpaperDelegate.qml
  wallpapers/image/imagepackage/platformcontents/touch/ui/config.qml

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: mart
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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