D6484: emit runningActivityListChanged on activity creation

[Marco Martin]

mart created this revision.
Restricted Application added projects: Plasma, Frameworks.
Restricted Application added subscribers: Frameworks, plasma-devel.

REVISION SUMMARY
  if an activity gets created and started immediately,
  runningActivityListChanged wasn't emitted, a symptom
  was the activitypager applet not updating the number of activities
  on activity creation, now emit this on setActivityInfo both
  when there wasn't such activity yet or the running
  status changes

TEST PLAN
  activity pager immediately reacts to activity creation,
  other kactivities users still work

REPOSITORY
  R6 KActivities

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D6484

AFFECTED FILES
  src/lib/activitiescache_p.cpp

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