/usr/include/muffin/meta/workspace.h is in libmuffin-dev 3.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*
 * Copyright (C) 2001 Havoc Pennington
 * Copyright (C) 2004, 2005 Elijah Newren
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Suite 500, Boston, MA
 * 02110-1335, USA.
 */
#ifndef META_WORKSPACE_H
#define META_WORKSPACE_H
/**
 * SECTION:Workspaces
 * @short_description:Workspaces
 *
 * A workspace is a set of windows which all live on the same
 * screen.  (You may also see the name "desktop" around the place,
 * which is the EWMH's name for the same thing.)  Only one workspace
 * of a screen may be active at once; all windows on all other workspaces
 * are unmapped.
 */
#include <meta/types.h>
#include <meta/boxes.h>
#include <meta/screen.h>
#define META_TYPE_WORKSPACE            (meta_workspace_get_type ())
#define META_WORKSPACE(obj)            (G_TYPE_CHECK_INSTANCE_CAST ((obj), META_TYPE_WORKSPACE, MetaWorkspace))
#define META_WORKSPACE_CLASS(klass)    (G_TYPE_CHECK_CLASS_CAST ((klass),  META_TYPE_WORKSPACE, MetaWorkspaceClass))
#define META_IS_WORKSPACE(obj)         (G_TYPE_CHECK_INSTANCE_TYPE ((obj), META_WORKSPACE_TYPE))
#define META_IS_WORKSPACE_CLASS(klass) (G_TYPE_CHECK_CLASS_TYPE ((klass),  META_TYPE_WORKSPACE))
#define META_WORKSPACE_GET_CLASS(obj)  (G_TYPE_INSTANCE_GET_CLASS ((obj),  META_TYPE_WORKSPACE, MetaWorkspaceClass))
typedef struct _MetaWorkspaceClass   MetaWorkspaceClass;
GType meta_workspace_get_type (void);
int  meta_workspace_index (MetaWorkspace *workspace);
GList* meta_workspace_list_windows (MetaWorkspace *workspace);
void meta_workspace_get_work_area_for_monitor (MetaWorkspace *workspace,
                                               int            which_monitor,
                                               MetaRectangle *area);
void meta_workspace_get_work_area_all_monitors (MetaWorkspace *workspace,
                                                MetaRectangle *area);
void meta_workspace_activate (MetaWorkspace *workspace, guint32 timestamp);
void meta_workspace_activate_with_focus (MetaWorkspace *workspace,
                                         MetaWindow    *focus_this,
                                         guint32        timestamp);
void meta_workspace_activate_with_direction_hint (MetaWorkspace       *workspace,
                                                  MetaMotionDirection  direction,
                                                  guint32              timestamp);
void meta_workspace_update_window_hints (MetaWorkspace *workspace);
void meta_workspace_set_builtin_struts (MetaWorkspace *workspace,
                                        GSList        *struts);
MetaWorkspace *meta_workspace_get_neighbor (MetaWorkspace      *workspace,
                                            MetaMotionDirection direction);
void meta_workspace_focus_default_window (MetaWorkspace *workspace,
                                          MetaWindow    *not_this_one,
                                          guint32        timestamp);
#endif
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