ipc: add `scratchpad_state` property to GET_TREE

See previous commit. This restores ipc parity with i3.

sway/ipc-json.c

@@ -289,6 +289,7 @@ static json_object *ipc_json_create_node(int id, const char* type, char *name,
 	json_object_object_add(object, "fullscreen_mode", json_object_new_int(0));
 	json_object_object_add(object, "sticky", json_object_new_boolean(false));
 	json_object_object_add(object, "floating", NULL);
+	json_object_object_add(object, "scratchpad_state", NULL);
 
 	return object;
 }
@@ -702,6 +703,10 @@ static void ipc_json_describe_container(struct sway_container *c, json_object *o
 	json_object_object_add(object, "fullscreen_mode",
 			json_object_new_int(c->pending.fullscreen_mode));
 
+	// sway doesn't track if window was resized in scratchpad, so we can't use "changed"
+	json_object_object_add(object, "scratchpad_state",
+			json_object_new_string(!c->scratchpad ? "none" : "fresh"));
+
 	struct sway_node *parent = node_get_parent(&c->node);
 	struct wlr_box parent_box = {0, 0, 0, 0};
 

sway/sway-ipc.7.scd

@@ -379,6 +379,9 @@ node and will have the following properties:
 |- floating
 :  string
 :  Floating state of container. Can be either "auto_off" or "user_on"
+|- scratchpad_state
+:  string
+:  Whether the window is in the scratchpad. Can be either "none" or "fresh"
 |- app_id
 :  string
 :  (Only views) For an xdg-shell view, the name of the application, if set.