D12102: Port Language KCM to Qt Quick

[Eike Hein]

hein created this revision.
hein added reviewers: Kirigami, mart.
Restricted Application added projects: Plasma, Kirigami.
Restricted Application added a subscriber: plasma-devel.
hein requested review of this revision.

REVISION SUMMARY
  - Changed the overall design from two lists to one list with a modal sheet to add more languages.
  - Replaced a modal "You need to relogin for changes" dialog with a MessageType.Positive InlineMessage.
  - Reworked the way missing languages are handled: The old KCM silently rewrote config and showed a warning. The new design shows an informative warning and removes the missing languages on the next save. Until then they're flagged as missing in the list.
  - Manages Apply button state correctly (or rather at all ...).
  
  This depends on D12097 <https://phabricator.kde.org/D12097>.
  
  This implements T7247 <https://phabricator.kde.org/T7247>.
  
  This is currently not final code. It's a WIP upload to give Marco
  something to work with to fix various Kirigami and SimpleKCM problems.
  
  Currently known issues:
  
  - Does not save (code is from old KCM, might have been broken there)
  - Disabled SwipeListItem actions do not show disabled
  - Placement of actions button in SwipeListItem is wonky if the contentItem is a RowLayout
  - SwipeListItem spews errors about positionAnimation after using an action
  - SwipeListItem is awkward to use, we need a drag-reorderable list delegate
  - OverlaySheet spews numerous warnings about not being able to find applicationWindow and activeFocusItem
  - The sheet is parented to the SimpleKCM's parent since there's no app window to be modal too
  - The footer inside an OverlaySheet sometimes moves up above the content instead of staying down
  - Even though SimpleKCM is just a Kirigami.ScrollablePage like Kirigami Gallery pages, an InlineMessage that fills the page width gets cut off on the left and right, so wonky code to insert margins next to them
  - List has window bg color as background instead of view background color

REPOSITORY
  R119 Plasma Desktop

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D12102

AFFECTED FILES
  kcms/CMakeLists.txt
  kcms/translations/CMakeLists.txt
  kcms/translations/Messages.sh
  kcms/translations/kcm_translations.desktop
  kcms/translations/kcmtranslations.cpp
  kcms/translations/kcmtranslations.h
  kcms/translations/kcmtranslationswidget.ui
  kcms/translations/package/contents/ui/main.qml
  kcms/translations/package/metadata.desktop
  kcms/translations/translations.cpp
  kcms/translations/translations.desktop
  kcms/translations/translations.h
  kcms/translations/translationsmodel.cpp
  kcms/translations/translationsmodel.h

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