D20707: Fix corner screen glows that suddenly pop up

zzag created this revision.
zzag added a reviewer: KWin.
Herald added a project: KWin.
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REVISION SUMMARY
  Depending on how pointer approaches a screen corner, the maximum
  distance between two may be smaller than 2 * edgeDistance. This can
  happen for example when approaching the corner along of any two adjacent
  screen edges.
  
  As a result, the calculated factor can be anywhere between 0 and 0.5
  when pointer enters approachGeometry(). This change adjusts calculation
  of the factor, so it always ranges from 0 to 1 no matter how the pointer
  approaches corners.

REPOSITORY
  R108 KWin

BRANCH
  correct-screen-edge-factor

REVISION DETAIL
  https://phabricator.kde.org/D20707

AFFECTED FILES
  screenedge.cpp

To: zzag, #kwin
Cc: kwin, jraleigh, GB_2, mkulinski, ragreen, jackyalcine, Pitel, iodelay, bwowk, ZrenBot, ngraham, alexeymin, lesliezhai, ali-mohamed, hardening, jensreuterberg, abetts, sebas, apol, mart