D17265: Ensure consistency when the layout is changed via the dbus protocol

mart created this revision.
mart added a reviewer: Plasma.
Herald added a project: KWin.
Herald added a subscriber: kwin.
mart requested review of this revision.

REVISION SUMMARY
  - save changes to the config files when the layout is saved
  - :name() works even if netrootinfo isn't there
  - as soon a rootinfo is set, connect all the desktops with name changes

TEST PLAN
  - tested with the kcm to add, remove and rename desktops, all of that works
  - setting the number of rows still only partly works: kwin notices it but
  
  the pager doesn't notice, a plasma restart is needed

REPOSITORY
  R108 KWin

BRANCH
  phab/vdconsistency

REVISION DETAIL
  https://phabricator.kde.org/D17265

AFFECTED FILES
  dbusinterface.cpp
  virtualdesktops.cpp
  virtualdesktops.h

To: mart, #plasma
Cc: kwin, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart