D23102: Reduce duplicate code calculating popup position

[Frederik Gladhorn]

gladhorn added a reviewer: KWin.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D23102

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