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[Alberts Muktupāvels <1436553@xxxxxxxxxxxxxxxxxx>]

If I understand correctly than this is compiz bug. Compiz should add
_GTK_FRAME_EXTENTS to _NET_SUPPORTED.

https://git.gnome.org/browse/gtk+/commit/?id=5ced234144ce63decbf5afc8a3517290b9027018

Reverting above GTK+ commit should "fix" csd windows, but real fix is to
add _GTK_FRAME_EXTENTS support to compiz.

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https://bugs.launchpad.net/bugs/1436553

Title:
  Transparent windows render black with Gtk3.16 and compiz

Status in compiz package in Ubuntu:
  New

Bug description:
  Running compiz_1%3a0.9.12.0+15.04.20150202-0ubuntu1 without unity (in
  mate compiled with gtk-3) and testing Gtk-3.16 I run into serious
  issues with failures to render certain Gtk Windows transparent.
  Hardware is AMD FX 8120 with radeon HD 6750 GPU.

  My theme sets popup windows used by menus transparent, and Gtk
  application windows with client side decoration (CSD) have
  transparency underlying the GtkHeaderBar. In the latter case this is
  what makes rounded corners possible.   The transparent popup windows
  used with my theme to support menus resembling gnome-shell's widgets
  in my hacked Gtk3 version of mate-panel work fine with Gtk3.14 but due
  to the window issue get black corners with compiz and Gtk-3.16.
  Windows drawn transparent with cairo still work, but windows set
  transparent by GTK usually do not,

  Changing the window manager to Mutter makes transparency work
  perfectly. In Gtk-3.14 transparency works in Metacity with compositing
  enabled, it does not with gtk-3.16.

  I am not sure whether this should be considered a compiz bug or a Gtk
  bug, but since transparency works fine in gnome-shell and mutter (as
  used by shell), I am not sure the GNOME team would consider this a bug
  they are willing to fix.  If nobody fixes this any GNOME application
  that forces client side decoration (such as the gtk3-demo or gtk3
  -widget-factory) will be ugly in Ubuntu unless the client side
  decorations have square corners.

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