[gtk+] gdk: Add a missing Since tag

[Matthias Clasen <matthiasc src gnome org>]

commit e4d3987b1766a48465254b39168f5668c9f8395e
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Mar 20 22:45:06 2016 -0400

    gdk: Add a missing Since tag
    
    gdk_drag_context_manage_dnd was introduced this cycle.

 gdk/gdkdnd.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkdnd.c b/gdk/gdkdnd.c
index 3cbd531..2aa205d 100644
--- a/gdk/gdkdnd.c
+++ b/gdk/gdkdnd.c
@@ -686,6 +686,8 @@ gdk_drag_drop_done (GdkDragContext *context,
  *   cancelled through other means.
  *
  * Returns: #TRUE if the drag and drop operation is managed.
+ *
+ * Since: 3.20
  **/
 gboolean
 gdk_drag_context_manage_dnd (GdkDragContext *context,
@@ -696,8 +698,7 @@ gdk_drag_context_manage_dnd (GdkDragContext *context,
   g_return_val_if_fail (GDK_IS_WINDOW (ipc_window), FALSE);
 
   if (GDK_DRAG_CONTEXT_GET_CLASS (context)->manage_dnd)
-    return GDK_DRAG_CONTEXT_GET_CLASS (context)->manage_dnd (context, ipc_window,
-                                                             actions);
+    return GDK_DRAG_CONTEXT_GET_CLASS (context)->manage_dnd (context, ipc_window, actions);
 
   return FALSE;
 }