D22760: [Notifications] Keep new delegate hidden until room has been cleared

[Kai Uwe Broulik]

broulik created this revision.
broulik added a reviewer: Plasma.
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REVISION SUMMARY
  When a new notification comes in, we first displace the existing ones to make room and then animate in the new one.
  However, due to the `PauseAnimation` the item appears with its full opacity ontop of the existing notifications that move out of the way.
  Add a `PropertyAction` to ensure the item has an `opacity` of zero initially.

TEST PLAN
  5.16 branch
  
  - Added multiple notifications to the popup, had them nicely appear instead of awkwardly overlapping visually

REPOSITORY
  R120 Plasma Workspace

REVISION DETAIL
  https://phabricator.kde.org/D22760

AFFECTED FILES
  applets/notifications/package/contents/ui/FullRepresentation.qml

To: broulik, #plasma
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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