D18000: Tweak slidingpopups effect to make animation smoother and more consistent

[Vlad Zahorodnii]

zzag accepted this revision.
This revision is now accepted and ready to land.

REPOSITORY
  R108 KWin

BRANCH
  arcpatch-D18000

REVISION DETAIL
  https://phabricator.kde.org/D18000

To: ngraham, #vdg, zzag, #kwin, sefaeyeoglu, ndavis, davidedmundson
Cc: niccolove, ngraham, abetts, davidedmundson, zzag, kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, sebas, apol, ahiemstra, mart
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