D12248: [Desktop Theme KCM] Port to new design

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, VDG.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.
broulik requested review of this revision.

REVISION SUMMARY
  The preview code could luckily be left completely untouched.

TEST PLAN
  - Verified that current index is correct upon opening
  - Verified that changing themes works
  - Verified that "open from file" works
  - Verified that GHNS works
  - Verified that theme removal works (is now animated, the delegate zooms out like a plasmoid on the desktop) and then the other items move ot fill the gap
  
  F5809788: Screenshot_20180416_174837.png <https://phabricator.kde.org/F5809788>
  In case of error I used the new `InlineMessage` (before it would just show a small label next to the buttons)
  F5809789: Screenshot_20180416_175219.png <https://phabricator.kde.org/F5809789>

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D12248

AFFECTED FILES
  kcms/desktoptheme/kcm.cpp
  kcms/desktoptheme/kcm.h
  kcms/desktoptheme/package/contents/ui/main.qml

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