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[luke <lukefromdc@xxxxxxxxxxxx>]

Launching cairo-dock with -W (workarounds) will remove the shadow in
cairo-dock is initially started with marco as the window manager, but it
then cannot be made to render above the mate-panel, even after switching
back to compiz. If no panel is under it, launching with -W under marco,
then switching to compiz removes the shadows from the menu but they
return on the right-side dock's applets except for the calender and
volume control, which never have them.

Launching cairo-dock with compiz running always produces the shadows,
even with the -W option.  In both window managers I always get this
warning (using Ubuntu's build cairo-dock_3.4.0-0ubuntu1_amd64.deb):

warning :  (/build/buildd/cairo-dock-3.4.0/src/implementations/cairo-dock-egl.c:gldi_register_egl_backend:232)  
  Cairo-Dock was not built with EGL support
warning :  (/build/buildd/cairo-dock-3.4.0/src/implementations/cairo-dock-glx.c:_initialize_opengl_backend:129)  
  couldn't find an appropriate visual, trying to get one without Stencil buffer
(it may cause some little deterioration in the rendering) ...

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Dock Devs, which is subscribed to Cairo-Dock Core.
https://bugs.launchpad.net/bugs/1407880

Title:
  Ugly, non-removable shadow around menus and dialog boxe

Status in Cairo-Dock : Core:
  New

Bug description:
  On Cairo-dock 3.4.0 under Ubuntu Vivid, I've noticed ugly shadows
  around the true window borders of the menu and most dialog boxes. The
  "calender and tasks" popup from the clock and the 3ed party calender
  applet do not have this problem, their bubbles look truly separate
  from the dock the way menus and dialogs do in gnome-shell or in
  Cinnamon. The rest have an ugly dark shadow at the edge of the window
  creating the impression of ugly, poorly done pseudo-transparency.

  This shadow appears in Compiz, in Marco (compositing enabled), and in
  Metacity(compositing enabled).  Disabling window decoration outright
  in Compiz removes similar shadows from all windows except the cairo-
  dock popups.  I cannot remove this by any configuration option in
  cairo-dock, nor in any window manager it seems.

  Shutting down compiz and running with NO window manager may have
  revealed the reason the calender is different: when rendered with no
  window manager and no compositing, all the other popup dialogs are
  rendered in black boxes just as the dock is without compositing. The
  calender, however, renders in a window that at first is black, then
  appears truly transparent (probably good pseudotransparency) and
  reveals the calender looking much as it does in a compositing window
  manager.

  I am running cairo-dock rendered over a MATE panel for the menu and
  tray applets. The goal is a look and feel much like Cinnamon with the
  better performance of MATE. CPU use is much less and all animation
  much smoother, but those ugly shadows need to go.

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