D23923: Drop checkArea helper

[Vlad Zahorodnii]

zzag marked 2 inline comments as done.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23923

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