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[luke <lukefromdc@xxxxxxxxxxxx>]

WORKAROUND: This shadow turned out to be caused by the GTK3 theme.

Any GTK3 theme setting a shadow for

.window-frame

will cause whatever shadow the theme specifies to appear on most cairo-
dock dialog box bubbles and on the application-menu bubble. For some
reason it was possible when starting under metacity with -W to remove
support for this shadow, even though the GTK theme was the cause of the
problem.

The theme css files can be edited to remove all references to a shadow
affecting .window-frame, and the border between the now transparent
window and the desktop becomes invisible. Since I use a custom GTK3
theme I just needed to find this and modify it.

If any other GTK3 theme generates this shadow, either change themes or
modify it as a workaround. I do not know if it is possible to fix this
in cairo-dock itself so no GTK theme can make the invisible window
boundary around a bubble show a shadow.  The code I used bringing in
this buq came from the "E17" GTK3 theme, which was the base from which I
built my refactored "UbuntuStudio_Legacy" GTK3 theme.

E17 is at

 http://gnome-look.org/content/show.php/?content=163472

I suspect this is not the only theme setting a window shadow

-- 
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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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