D22381: Add previous-/nextActivity methods

[Christian Muehlhaeuser]

muesli created this revision.
muesli added a reviewer: ivan.
Herald added a project: Plasma.
Herald added a subscriber: plasma-devel.
muesli requested review of this revision.

REVISION SUMMARY
  These two methods can be used to switch to the previous/next activity in
  alphabetical order. They are exposed via the DBus interface. This
  functionality can also be accessed by kactivities(-cli) and plasmashell, which
  currently both implement their own separate versions of it.
  
  @Ivan mentioned being a bit wary of keeping a sorted activity list in
  kactivitymanagerd, so I've opted to only retrieve and sort the list on demand
  here.

REPOSITORY
  R161 KActivity Manager Service

BRANCH
  prevnext-activity (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D22381

AFFECTED FILES
  src/common/dbus/org.kde.ActivityManager.Activities.xml
  src/service/Activities.cpp
  src/service/Activities.h
  src/service/Activities_p.h

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