D8232: Add option to center shadow

[Henrik Fehlauer]

rkflx added a comment.


  FWIW, I would love this too. IMHO this should even be the default (but is obviously something for the https://phabricator.kde.org/tag/vdg/ to decide). Reasons:
  
  - The shadow not only adds a spatial dimension to the visuals, it also is important in separating the contents of cascaded windows. Currently, this second function is not achieved for the left and top borders.
  - It would be consistent with GNOME, Windows (all borders) and MacOS (all borders except the top).
  
  Patch LGTM.
  
  However, I noticed a small inconsistency (probably just food for thought and not something for this patch): Shadows of menus do not respect this, they are still offset. While that's the behaviour on Windows too, on MacOS menus have shadows on all three borders.

REVISION DETAIL
  https://phabricator.kde.org/D8232

To: rpelorosso, #breeze, #vdg
Cc: rkflx, ngraham, davidedmundson, mart, plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol
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