[mutter/gnome-3-28] clutter-seat-evdev: Add function to get device by id

[Marco Trevisan <marcotrevi src gnome org>]

commit 5142c8c7e721f7cff91f651178aad55a69b56df1
Author: Marco Trevisan (Treviño) <mail 3v1n0 net>
Date:   Tue May 15 12:04:56 2018 +0100

    clutter-seat-evdev: Add function to get device by id
    
    
    (cherry picked from commit 5f83d9a5c854873746a31d0cc4d118c9a6d87ddd)

 clutter/clutter/evdev/clutter-seat-evdev.c | 18 ++++++++++++++++++
 clutter/clutter/evdev/clutter-seat-evdev.h |  3 +++
 2 files changed, 21 insertions(+)
---
diff --git a/clutter/clutter/evdev/clutter-seat-evdev.c b/clutter/clutter/evdev/clutter-seat-evdev.c
index e91f3673b..a453b1150 100644
--- a/clutter/clutter/evdev/clutter-seat-evdev.c
+++ b/clutter/clutter/evdev/clutter-seat-evdev.c
@@ -858,6 +858,24 @@ clutter_seat_evdev_free (ClutterSeatEvdev *seat)
   g_free (seat);
 }
 
+ClutterInputDevice *
+clutter_seat_evdev_get_device (ClutterSeatEvdev *seat,
+                               gint              id)
+{
+  ClutterInputDevice *device;
+  GSList *l;
+
+  for (l = seat->devices; l; l = l->next)
+    {
+      device = l->data;
+
+      if (clutter_input_device_get_device_id (device) == id)
+        return device;
+    }
+
+  return NULL;
+}
+
 void
 clutter_seat_evdev_set_stage (ClutterSeatEvdev *seat,
                               ClutterStage     *stage)
diff --git a/clutter/clutter/evdev/clutter-seat-evdev.h b/clutter/clutter/evdev/clutter-seat-evdev.h
index 0fb89e33e..4bb319b3a 100644
--- a/clutter/clutter/evdev/clutter-seat-evdev.h
+++ b/clutter/clutter/evdev/clutter-seat-evdev.h
@@ -139,6 +139,9 @@ void clutter_seat_evdev_set_libinput_seat (ClutterSeatEvdev     *seat,
 
 void clutter_seat_evdev_sync_leds (ClutterSeatEvdev *seat);
 
+ClutterInputDevice * clutter_seat_evdev_get_device (ClutterSeatEvdev *seat,
+                                                    gint              id);
+
 ClutterTouchState * clutter_seat_evdev_acquire_touch_state (ClutterSeatEvdev *seat,
                                                             int               device_slot);