[gtk+] gdk,xi2: Make more resilient about not yet known devices

[Carlos Garnacho <carlosg src gnome org>]

commit 358ecad50147f9ee377a86fb70a7e58cc600616f
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun Dec 18 18:56:51 2011 +0100

    gdk,xi2: Make more resilient about not yet known devices
    
    Dealing with disabled devices may turn into hierarchy/device
    changed events on device IDs with no backing GdkDevice yet,
    so protect against that. The device attachment will be handled
    correctly when the device is enabled later.

 gdk/x11/gdkdevicemanager-xi2.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)
---
diff --git a/gdk/x11/gdkdevicemanager-xi2.c b/gdk/x11/gdkdevicemanager-xi2.c
index afa9f54..d1481aa 100644
--- a/gdk/x11/gdkdevicemanager-xi2.c
+++ b/gdk/x11/gdkdevicemanager-xi2.c
@@ -605,6 +605,9 @@ handle_hierarchy_changed (GdkX11DeviceManagerXI2 *device_manager,
           slave = g_hash_table_lookup (device_manager->id_table,
                                        GINT_TO_POINTER (ev->info[i].deviceid));
 
+          if (!slave)
+            continue;
+
           /* Remove old master info */
           master = gdk_device_get_associated_device (slave);
 
@@ -627,7 +630,10 @@ handle_hierarchy_changed (GdkX11DeviceManagerXI2 *device_manager,
                   master = g_hash_table_lookup (device_manager->id_table,
                                                 GINT_TO_POINTER (info->attachment));
                   XIFreeDeviceInfo (info);
+                }
 
+              if (master)
+                {
                   _gdk_device_set_associated_device (slave, master);
                   _gdk_device_add_slave (master, slave);
 
@@ -651,10 +657,13 @@ handle_device_changed (GdkX11DeviceManagerXI2 *device_manager,
   device = g_hash_table_lookup (device_manager->id_table,
                                 GUINT_TO_POINTER (ev->deviceid));
 
-  _gdk_device_reset_axes (device);
-  translate_device_classes (display, device, ev->classes, ev->num_classes);
+  if (device)
+    {
+      _gdk_device_reset_axes (device);
+      translate_device_classes (display, device, ev->classes, ev->num_classes);
 
-  g_signal_emit_by_name (G_OBJECT (device), "changed");
+      g_signal_emit_by_name (G_OBJECT (device), "changed");
+    }
 }
 
 static GdkCrossingMode