[gnome-settings-daemon] wacom: Make set_current_stylus a no-op if already set

[Bastien Nocera <hadess src gnome org>]

commit 81190d468d2b8383bd0b8ce5834cbc6fd7f98ee9
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Dec 14 17:52:50 2011 +0000

    wacom: Make set_current_stylus a no-op if already set

 plugins/wacom/gsd-wacom-device.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/plugins/wacom/gsd-wacom-device.c b/plugins/wacom/gsd-wacom-device.c
index af6f545..33b13d1 100644
--- a/plugins/wacom/gsd-wacom-device.c
+++ b/plugins/wacom/gsd-wacom-device.c
@@ -611,6 +611,13 @@ gsd_wacom_device_set_current_stylus (GsdWacomDevice *device,
 
 	g_return_if_fail (GSD_IS_WACOM_DEVICE (device));
 
+	/* Don't change anything if the stylus is already set */
+	if (device->priv->last_stylus != NULL) {
+		GsdWacomStylus *stylus = device->priv->last_stylus;
+		if (stylus->priv->id == stylus_id)
+			return;
+	}
+
 	for (l = device->priv->styli; l; l = l->next) {
 		GsdWacomStylus *stylus = l->data;