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[luke <lukefromdc@xxxxxxxxxxxx>]

This is NOT FIXED by compiz 0.9.12.2, at least not in Debian Unstable
with gtk 3.17.9 and has not been fixed on my system by any version I
have tried except the version I built myself from
https://code.launchpad.net/~albertsmuktupavels/compiz/add-gtk-frame-
extents-to-net-supported with the "gtk" directory replaced with a more
recent one for Metacity 3.16 support.

Source code for this available at 
https://archive.org/download/DebianPackagesForMate-desktopWityGtk3AndCustomPanelTheme/compiz-0.9.12.0extents-supportedgtk3.16-1luke4_amd64.deb  

Debian packages for Debian Unstable also published in the same article, which is a collection of MATE-gtk3 packages plus compiz and network-manager-gnome packages:
https://archive.org/details/DebianPackagesForMate-desktopWityGtk3AndCustomPanelTheme

I have yet to get compositing of CSD apps to work on any other compiz
version. The modified MATE packages (which support a special transparent
panel menu theme) have composition support forced and will work with any
version of Compiz, but Debian does not patch GNOME apps to remove CSD so
this issue is important there.

-- 
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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:
  Fix Released

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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