[gtk+] Add a Since annotation to gdk_device_get_last_event_window

[Matthias Clasen <matthiasc src gnome org>]

commit 5b2236e3d7f60807edfb2de1829c0633cb3b59c6
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Mar 12 23:04:37 2014 -0400

    Add a Since annotation to gdk_device_get_last_event_window

 gdk/gdkdevice.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gdk/gdkdevice.c b/gdk/gdkdevice.c
index 24499d7..52b66db 100644
--- a/gdk/gdkdevice.c
+++ b/gdk/gdkdevice.c
@@ -1729,6 +1729,8 @@ _gdk_device_window_at_position (GdkDevice        *device,
  * application's windows.
  *
  * Returns: (transfer none) (allow-none): the last window the device
+ *
+ * Since: 3.12
  */
 GdkWindow *
 gdk_device_get_last_event_window (GdkDevice *device)