D20902: Add SDDM theme login load feedback

[Björn Feber]

GB_2 created this revision.
GB_2 added reviewers: Plasma, VDG.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
GB_2 requested review of this revision.

REVISION SUMMARY
  Currently, when you log in you can see a short freeze which looks bad. This patch adds some feedback by disabling and reducing the opacity of the controls after you begin the login (a busy cursor wouldn't work well, because it only changes when you move the mouse).
  F6800357: SDDM Login Load Feedback.mp4 <https://phabricator.kde.org/F6800357>

TEST PLAN
  Log in to a user.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  add-sddm-theme-login-load-feedback (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D20902

AFFECTED FILES
  sddm-theme/Login.qml
  sddm-theme/Main.qml

To: GB_2, #plasma, #vdg
Cc: #vdg, plasma-devel, #plasma, jraleigh, GB_2, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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