[gtk+] wayland: Observe GDK_SEAT_CAPABILITY_TABLET_STYLUS on gdk_seat_get_slaves()

[Carlos Garnacho <carlosg src gnome org>]

commit 5b9adfba466b53a7fb67d943f40f562d8c9acaaa
Author: Carlos Garnacho <carlosg gnome org>
Date:   Tue Jul 25 15:35:41 2017 +0200

    wayland: Observe GDK_SEAT_CAPABILITY_TABLET_STYLUS on gdk_seat_get_slaves()
    
    This flag wasn't being honored so far...

 gdk/wayland/gdkdevice-wayland.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)
---
diff --git a/gdk/wayland/gdkdevice-wayland.c b/gdk/wayland/gdkdevice-wayland.c
index 1f043f6..03282ae 100644
--- a/gdk/wayland/gdkdevice-wayland.c
+++ b/gdk/wayland/gdkdevice-wayland.c
@@ -4884,6 +4884,19 @@ gdk_wayland_seat_get_slaves (GdkSeat             *seat,
   if (wayland_seat->touch && (capabilities & GDK_SEAT_CAPABILITY_TOUCH))
     slaves = g_list_prepend (slaves, wayland_seat->touch);
 
+  if (wayland_seat->tablets && (capabilities & GDK_SEAT_CAPABILITY_TABLET_STYLUS))
+    {
+      GList *l;
+
+      for (l = wayland_seat->tablets; l; l = l->next)
+        {
+          GdkWaylandTabletData *tablet = l->data;
+
+          slaves = g_list_prepend (slaves, tablet->stylus_device);
+          slaves = g_list_prepend (slaves, tablet->eraser_device);
+        }
+    }
+
   return slaves;
 }