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/usr/share/themes/oxygen-gtk/gtk-3.0/argb-apps.conf is in gtk3-engines-oxygen 1.3.5-0ubuntu1.

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#################################################################
# this file is part of the oxygen gtk engine
# Copyright (c) 2010 Hugo Pereira Da Costa <hugo.pereira@free.fr>
# Copyright (c) 2010 Ruslan Kabatsayev <b7.10110111@gmail.com>
#
# This  library is free  software; you can  redistribute it and/or
# modify it  under  the terms  of the  GNU Lesser  General  Public
# License  as published  by the Free  Software  Foundation; either
# version 2 of the License, or( at your option ) any later version.
#
# This library is distributed  in the hope that it will be useful,
# but  WITHOUT ANY WARRANTY; without even  the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License  along  with  this library;  if not,  write to  the Free
# Software Foundation, Inc., 51  Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
#################################################################

#################################################################
# syntax:
# enable/disable argb colormap for applications
# syntax is the following
# enable:app1:app2:app3 will enable argb for app1, app2, etC.
# disable:app1:app2:app3 will disable argb for app1, app2, etc.
#
# rules:
# 1/ if an application is not found in the file, argb support will be _enabled_
# 2/ if an application is found in both an "enable:" and a "disable:" lines,
#    the last line containing the application is used to decide whether argb support
#    is enabled or disabled.
# 3/ lines that begin neither with enable or disable are ignored.
#
# additional keywords:
# disable:all can be used to disable all applications except the ones appearing in "enable:" lines
# enable:all can be used to enable all applications no matter what, therefore ignoring all "disable:"
# lines, consistently with rull 2/ above
#
###########################################################

# enable all applications, by default
# note that this line is not necessary since applications not found
# in this file have argb support enabled anyway
enable:all

############################################################
# The list of disabled applications is now empty, because the way argb is handled should now be safe for all applications
# if you have non-empty user argb-apps.conf file, it is recommanded to try empty it.
disable:xfrun4