D5910: make shadows work on wayland

[Marco Martin]

mart created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  since from Qt 5.8 QtWayland destroys its surfaces every time
  a window gets hidden and recreates them again when is shown
  (that's how the protocol is defined) install the shadows
  every time the window is shown, use the window id in _widgets
  to track creation/destruction of the surface

TEST PLAN
  popup menus have correct shadows on wayland now

REPOSITORY
  R31 Breeze

BRANCH
  phab/waylandshadow

REVISION DETAIL
  https://phabricator.kde.org/D5910

AFFECTED FILES
  kstyle/breezeshadowhelper.cpp

To: mart, #plasma
Cc: plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas
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