D16095: [Background Model] Use own QCache for thumbnails

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, davidedmundson.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  Previously it would use an on-disk `KImageCache` which would never be invalidated. Moreover, it just uses `KIO::PreviewJob` which does its own more clever (compares mtime and other properties) on-disk caching already.
  It's using its own `QCache` rather than `QPixmapCache` to not jeopardize other caching for the potentially large wallpaper thumbnails that are only relevant while the dialog iso pen.
  
  BUG: 395447
  FIXED-IN: 5.15.0

TEST PLAN
  - Scrolled through the list, had thumbnails be generated and cached
  - If there were too many some of them were discarded and this worked without crashing

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D16095

AFFECTED FILES
  wallpapers/image/CMakeLists.txt
  wallpapers/image/backgroundlistmodel.cpp
  wallpapers/image/backgroundlistmodel.h

To: broulik, #plasma, davidedmundson
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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