D14999: [PanelShadows] Use 0 offset for disabled borders on Wayland

[Vlad Zagorodniy]

zzag created this revision.
Herald added a project: Plasma.
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REVISION SUMMARY
  On Wayland, if some border is disabled, we don't attach corresponding
  empty tile. Yet, we set offset of 1 for that border.
  
  KWin relies on offset values to calculate bounding box for shadows.
  
  For example, if a panel has only top border enabled, then the bounding
  box will be 2 pixel wider(and 1px taller) than it should be. This can
  result in having 1px artefacts on neighboring screens.
  
  In general, we don't have to attach empty tiles for disabled borders.
  Thus, we can set corresponding offsets to 0.

REPOSITORY
  R120 Plasma Workspace

BRANCH
  wayland-shadows

REVISION DETAIL
  https://phabricator.kde.org/D14999

AFFECTED FILES
  shell/panelshadows.cpp

To: zzag
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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