D7256: emit previously shown notifications after resume from idle

[Julian Wolff]

progwolff created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  This is an attempt to improve the behaviour of notifications that are triggered while the session is idle. This is related to (but not fixing) Bug 378032.
  	Notifications that are triggered while the session is idle might be missed by the user. With these changes, notifications will be shown again when the session resumes from idle.
  
  This behaviour might be controversial. A history of notifications seems to be unwanted. I tried to find a way to make missing important notifications less likely while not annoying the user too much.

TEST PLAN
  Stay away from the keyboard and the mouse for more than 30 seconds. Then remotely trigger a notification and wait until it disappears. It should show up again once you move the mouse or hit a key.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D7256

AFFECTED FILES
  dataengines/notifications/CMakeLists.txt
  dataengines/notifications/notificationsengine.cpp
  dataengines/notifications/notificationsengine.h

To: progwolff, #plasma
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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