D24986: [wallpapers/image] Randomise new batches of images in the slideshow

[David Edmundson]

davidedmundson created this revision.
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REVISION SUMMARY
  There was a concious decision that when we add a new wallpaper we should
  append to the existing random order collection, rather than shuffle
  existing ones.
  
  The logic is fine but if we start with 0 wallpapers and then add 20 new
  ones we don't shuffle anything.
  
  This patch changes it so when a new batch of N wallpapers is added,
  those N are shuffled when appending to the existing sort order.
  
  BUG: 413463
  FIXED-IN: 5.17.2

TEST PLAN
  qDebug + ran a few times

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D24986

AFFECTED FILES
  wallpapers/image/slidefiltermodel.cpp

To: davidedmundson, #plasma
Cc: plasma-devel, LeGast00n, The-Feren-OS-Dev, jraleigh, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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