[mutter] backends: Notify tablet mapping changes in the UI

[Carlos Garnacho <carlosg src gnome org>]

commit ff453c114317858bfec2b8e1a3986c90807e86e3
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Dec 28 12:08:34 2016 +0100

    backends: Notify tablet mapping changes in the UI
    
    This takes over the older code in g-s-d.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=771098

 src/backends/meta-input-settings.c |   17 ++++++++++++-----
 1 files changed, 12 insertions(+), 5 deletions(-)
---
diff --git a/src/backends/meta-input-settings.c b/src/backends/meta-input-settings.c
index fc9a694..166e728 100644
--- a/src/backends/meta-input-settings.c
+++ b/src/backends/meta-input-settings.c
@@ -1559,7 +1559,7 @@ meta_input_settings_cycle_tablet_output (MetaInputSettings  *input_settings,
   MetaInputSettingsPrivate *priv;
   DeviceMappingInfo *info;
   MetaOutput *output;
-  const gchar *edid[4] = { 0 };
+  const gchar *edid[4] = { 0 }, *pretty_name = NULL;
 
   g_return_if_fail (META_IS_INPUT_SETTINGS (input_settings));
   g_return_if_fail (CLUTTER_IS_INPUT_DEVICE (device));
@@ -1571,10 +1571,14 @@ meta_input_settings_cycle_tablet_output (MetaInputSettings  *input_settings,
   g_return_if_fail (info != NULL);
 
 #ifdef HAVE_LIBWACOM
-  /* Output rotation only makes sense on external tablets */
-  if (info->wacom_device &&
-      (libwacom_get_integration_flags (info->wacom_device) != WACOM_DEVICE_INTEGRATED_NONE))
-    return;
+  if (info->wacom_device)
+    {
+      /* Output rotation only makes sense on external tablets */
+      if (libwacom_get_integration_flags (info->wacom_device) != WACOM_DEVICE_INTEGRATED_NONE)
+        return;
+
+      pretty_name = libwacom_get_name (info->wacom_device);
+    }
 #endif
 
   output = meta_input_settings_find_output (input_settings,
@@ -1586,6 +1590,9 @@ meta_input_settings_cycle_tablet_output (MetaInputSettings  *input_settings,
   edid[1] = output ? output->product : "";
   edid[2] = output ? output->serial : "";
   g_settings_set_strv (info->settings, "display", edid);
+
+  meta_display_show_tablet_mapping_notification (meta_get_display (),
+                                                 device, pretty_name);
 }
 
 static void