D9014: Fix Qt warnings when rect is invalid, e.g. QRect(0, 2111 3840x0)

[Vlad Zagorodniy]

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

REPOSITORY
  R108 KWin

BRANCH
  fix_qt_warnings

REVISION DETAIL
  https://phabricator.kde.org/D9014

To: dfaure, graesslin, zzag
Cc: kwin, LeGast00n, fmonteiro, 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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