D16359: [effects/sheet] Decrease the default animation duration

zzag created this revision.
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REVISION SUMMARY
  For some historical reasons, the sheet effect uses animation duration of
  500ms. In comparison to other effects that animate the appearing and the
  disappearing of windows, 500ms is too high value for the duration.
  
  As the title says, this change decreases the default animation duration
  to 300ms. The new duration is more saner.
  
  The opacity is animated to make the effect look smoother with the
  shorter animation duration.
  
  BUG: 400021
  FIXED-IN: 5.15.0

REPOSITORY
  R108 KWin

BRANCH
  effects-sheet-decrease-duration

REVISION DETAIL
  https://phabricator.kde.org/D16359

AFFECTED FILES
  effects/sheet/sheet.cpp

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