[mutter] clutter: Add an accessibility virtual device

[Carlos Garnacho <carlosg src gnome org>]

commit 4d21650d6d9aaee263191f7ed019869a9d4152dc
Author: Olivier Fourdan <ofourdan redhat com>
Date:   Wed Feb 27 15:57:22 2019 +0100

    clutter: Add an accessibility virtual device
    
    For accessibility features, being either keyboard accessibility to
    implement mousekeys, or pointer accessibility to implement simulated
    secondary click or dwell click, we need to have a virtual device.
    
    Add that virtual device in ClutterInputDevice so it can be used either
    for keyboard or pointer accessibility.
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/512

 clutter/clutter/clutter-device-manager-private.h | 3 +++
 clutter/clutter/clutter-input-device.c           | 3 +++
 2 files changed, 6 insertions(+)
---
diff --git a/clutter/clutter/clutter-device-manager-private.h 
b/clutter/clutter/clutter-device-manager-private.h
index 2364fd27c..d08e66ba4 100644
--- a/clutter/clutter/clutter-device-manager-private.h
+++ b/clutter/clutter/clutter-device-manager-private.h
@@ -143,6 +143,9 @@ struct _ClutterInputDevice
 
   guint has_cursor : 1;
   guint is_enabled : 1;
+
+  /* Accessiblity */
+  ClutterVirtualInputDevice *accessibility_virtual_device;
 };
 
 typedef void (*ClutterEmitInputDeviceEvent) (ClutterEvent       *event,
diff --git a/clutter/clutter/clutter-input-device.c b/clutter/clutter/clutter-input-device.c
index be01062cc..c289f81b7 100644
--- a/clutter/clutter/clutter-input-device.c
+++ b/clutter/clutter/clutter-input-device.c
@@ -107,6 +107,9 @@ clutter_input_device_dispose (GObject *gobject)
       device->associated = NULL;
     }
 
+  if (device->accessibility_virtual_device)
+    g_clear_object (&device->accessibility_virtual_device);
+
   g_clear_pointer (&device->axes, g_array_unref);
   g_clear_pointer (&device->keys, g_array_unref);
   g_clear_pointer (&device->scroll_info, g_array_unref);