[Differential] [Request, 463 lines] D3685: Add SDDM theme install/uninstall with GHNS to the SDDM KCM

[davidedmundson (David Edmundson)]

davidedmundson created this revision.
davidedmundson added a reviewer: Plasma.
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Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Add SDDM theme install/uninstall with Get Hot New Stuff to the SDDM KCM. 
  Button arrangement is copied from the colour KCM. We can install from either a 
  local .zip file or the KDE store.
  
  It assumes a zip file containing a folder/folders of themes to be installed 
  into the SDDM directory. metadata is very loosely checked.
  
  As it needs to be root to install, this is added into the helper.
  
  An additional executable is needed to make KNS work properly. We need to keep track of which 
  KNS packages contain which themes, which is done in a local config file.

TEST PLAN
  Installed a theme via GHNS
  Uninstalled it
  Installed a theme manually
  Uninstalled it

REPOSITORY
  R123 SDDM Configuration Panel (KCM)

BRANCH
  ghns

REVISION DETAIL
  https://phabricator.kde.org/D3685

AFFECTED FILES
  CMakeLists.txt
  kcm_sddm.actions
  sddmauthhelper.cpp
  sddmauthhelper.h
  sddmtheme.knsrc
  sddmthemeinstaller.cpp
  src/CMakeLists.txt
  src/sddmkcm.cpp
  src/themeconfig.cpp
  src/themeconfig.h
  src/themesmodel.cpp
  src/themesmodel.h
  src/ui/themeconfig.ui

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

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