evas_device: add seat_id property, set seat id for default fallback seat

@feature

src/lib/evas/Evas_Common.h

@@ -1047,6 +1047,30 @@ EAPI void evas_device_name_set(Evas_Device *dev, const char *name);
  */
 EAPI const char *evas_device_name_get(const Evas_Device *dev);
 
+/**
+ * Set the seat id of a device
+ *
+ * @p dev The device to set the seat id of
+ * @p name The seat id
+ *
+ * @since 1.20
+ */
+EAPI void evas_device_seat_id_set(Evas_Device *dev, unsigned int id);
+
+/**
+ * Get the seat id of a device
+ *
+ * @p dev The device to query
+ * @return The device seat id or 0 if none is set
+ *
+ * This gets the seat id set by evas_device_seat id_set().
+ *
+ * A seat id is the hardware id of the seat.
+ *
+ * @since 1.20
+ */
+EAPI unsigned int evas_device_seat_id_get(const Evas_Device *dev);
+
 /**
  * Set the description of a device as a string
  *

src/lib/evas/canvas/evas_device.c

@@ -349,6 +349,18 @@ evas_device_emulation_source_get(const Evas_Device *dev)
    return efl_input_device_source_get(dev);
 }
 
+EAPI void
+evas_device_seat_id_set(Evas_Device *dev, unsigned int id)
+{
+   efl_input_device_seat_id_set(dev, id);
+}
+
+EAPI unsigned int
+evas_device_seat_id_get(const Evas_Device *dev)
+{
+   return efl_input_device_seat_id_get(dev);
+}
+
 void
 _evas_device_cleanup(Evas *eo_e)
 {

src/lib/evas/canvas/evas_main.c

@@ -1014,6 +1014,7 @@ evas_output_method_set(Evas *eo_e, int render_method)
    e->default_seat = evas_device_add_full(eo_e, "default", "The default seat",
                                           NULL, NULL, EVAS_DEVICE_CLASS_SEAT,
                                           EVAS_DEVICE_SUBCLASS_NONE);
+   evas_device_seat_id_set(e->default_seat, 1);
    e->default_mouse = evas_device_add_full(eo_e, "keyboard",
                                            "The default mouse",
                                            e->default_seat, NULL,