clients: track seat_version per seat, not per display

Apparently it's possible for a compositor to advertise seats with
different versions on the same connection, so this makes us more robust
against that dubious behaviour.

This also tracks the seat version we requested instead of the advertised
maximum.

Signed-off-by: Derek Foreman <derekf@osg.samsung.com>
Reviewed-by: David FORT <contact@hardening-consulting.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

clients/window.c

@@ -140,7 +140,6 @@ struct display {
 	void *dummy_surface_data;
 
 	int has_rgb565;
-	int seat_version;
 	int data_device_manager_version;
 };
 
@@ -362,6 +361,7 @@ struct input {
 	uint32_t repeat_sym;
 	uint32_t repeat_key;
 	uint32_t repeat_time;
+	int seat_version;
 };
 
 struct output {
@@ -3256,7 +3256,7 @@ seat_handle_capabilities(void *data, struct wl_seat *seat,
 		wl_pointer_add_listener(input->pointer, &pointer_listener,
 					input);
 	} else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && input->pointer) {
-		if (input->display->seat_version >= WL_POINTER_RELEASE_SINCE_VERSION)
+		if (input->seat_version >= WL_POINTER_RELEASE_SINCE_VERSION)
 			wl_pointer_release(input->pointer);
 		else
 			wl_pointer_destroy(input->pointer);
@@ -3269,7 +3269,7 @@ seat_handle_capabilities(void *data, struct wl_seat *seat,
 		wl_keyboard_add_listener(input->keyboard, &keyboard_listener,
 					 input);
 	} else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && input->keyboard) {
-		if (input->display->seat_version >= WL_KEYBOARD_RELEASE_SINCE_VERSION)
+		if (input->seat_version >= WL_KEYBOARD_RELEASE_SINCE_VERSION)
 			wl_keyboard_release(input->keyboard);
 		else
 			wl_keyboard_destroy(input->keyboard);
@@ -3281,7 +3281,7 @@ seat_handle_capabilities(void *data, struct wl_seat *seat,
 		wl_touch_set_user_data(input->touch, input);
 		wl_touch_add_listener(input->touch, &touch_listener, input);
 	} else if (!(caps & WL_SEAT_CAPABILITY_TOUCH) && input->touch) {
-		if (input->display->seat_version >= WL_TOUCH_RELEASE_SINCE_VERSION)
+		if (input->seat_version >= WL_TOUCH_RELEASE_SINCE_VERSION)
 			wl_touch_release(input->touch);
 		else
 			wl_touch_destroy(input->touch);
@@ -5218,17 +5218,20 @@ fini_xkb(struct input *input)
 }
 
 static void
-display_add_input(struct display *d, uint32_t id)
+display_add_input(struct display *d, uint32_t id, int display_seat_version)
 {
 	struct input *input;
+	int seat_version = MIN(display_seat_version, 4);
 
 	input = xzalloc(sizeof *input);
 	input->display = d;
 	input->seat = wl_registry_bind(d->registry, id, &wl_seat_interface,
-				       MIN(d->seat_version, 4));
+				       seat_version);
 	input->touch_focus = NULL;
 	input->pointer_focus = NULL;
 	input->keyboard_focus = NULL;
+	input->seat_version = seat_version;
+
 	wl_list_init(&input->touch_point_list);
 	wl_list_insert(d->input_list.prev, &input->link);
 
@@ -5278,7 +5281,7 @@ input_destroy(struct input *input)
 		else
 			wl_data_device_destroy(input->data_device);
 	}
-	if (input->display->seat_version >= WL_POINTER_RELEASE_SINCE_VERSION) {
+	if (input->seat_version >= WL_POINTER_RELEASE_SINCE_VERSION) {
 		if (input->touch)
 			wl_touch_release(input->touch);
 		if (input->pointer)
@@ -5365,8 +5368,7 @@ registry_handle_global(void *data, struct wl_registry *registry, uint32_t id,
 	} else if (strcmp(interface, "wl_output") == 0) {
 		display_add_output(d, id);
 	} else if (strcmp(interface, "wl_seat") == 0) {
-		d->seat_version = version;
-		display_add_input(d, id);
+		display_add_input(d, id, version);
 	} else if (strcmp(interface, "wl_shm") == 0) {
 		d->shm = wl_registry_bind(registry, id, &wl_shm_interface, 1);
 		wl_shm_add_listener(d->shm, &shm_listener, d);