D21064: [effects/cubeslide] Cancel active animation when number of desktops has changed

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REVISION SUMMARY
  If a virtual desktop is removed, then desktopChanged will be followed by
  numberDesktopsChanged signal. In which case, we have to cancel the
  active animation because front_desktop might be no longer valid when
  it's time to perform compositing.
  
  BUG: 406452

REPOSITORY
  R108 KWin

BRANCH
  cancel-cube-slide-animation

REVISION DETAIL
  https://phabricator.kde.org/D21064

AFFECTED FILES
  effects/cubeslide/cubeslide.cpp
  effects/cubeslide/cubeslide.h

To: zzag, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart