D17526: [autotests] Test window open/close animations

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REVISION SUMMARY
  The idea behind this autotest is to verify that different window
  open/close animation effects behave similarly.
  
  Currently, we just check whether Fade/Glide/Scale effect tries to animate
  the appearing or the disappearing of toplevels. In the future, the
  autotest will be extended to verify that there are no conflicts between
  those three effects and the Login/Logout effect, etc.

TEST PLAN
  Ran the test, found a bug in the Fade effect, fixed it.

REPOSITORY
  R108 KWin

BRANCH
  test-toplevel-open-close-animations

REVISION DETAIL
  https://phabricator.kde.org/D17526

AFFECTED FILES
  autotests/integration/effects/CMakeLists.txt
  autotests/integration/effects/toplevel_open_close_animation_test.cpp
  effects/fade/package/contents/code/main.js

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