D29112: [applet] Port to Kirigami.PlaceholderMessage

[Nathaniel Graham]

ngraham created this revision.
ngraham added reviewers: VDG, Plasma, dantti, niccolove.
Herald added a subscriber: kde-utils-devel.
ngraham requested review of this revision.

REVISION SUMMARY
  Port the applet to the newly-introduced Kirigami.PlaceholderMessage, which replaces a
  homegrown implementation as well as the complicated and redundant state machine (half of
  whose logic was already set declaratively on the main page).

TEST PLAN
  F8254228: Printers.png <https://phabricator.kde.org/F8254228>

REPOSITORY
  R363 Print Manager

BRANCH
  port-to-PlaceholderLabel (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D29112

AFFECTED FILES
  CMakeLists.txt
  plasmoid/package/contents/ui/PopupDialog.qml
  plasmoid/package/contents/ui/StatusView.qml

To: ngraham, #vdg, #plasma, dantti, niccolove
Cc: kde-utils-devel
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