commands: allow tiled containers to be stickied

This also stops stickied containers from losing its sticky status when
it is tiled, allowing it to be immediately stickied when floated again.

sway/commands/floating.c

@@ -45,7 +45,7 @@ struct cmd_results *cmd_floating(int argc, char **argv) {
 				"Cannot set floating status on a hidden scratchpad container");
 	}
 
-	bool wants_floating = 
+	bool wants_floating =
 		parse_boolean(argv[0], container_is_floating(container));
 
 	container_set_floating(container, wants_floating);

sway/commands/sticky.c

@@ -22,14 +22,9 @@ struct cmd_results *cmd_sticky(int argc, char **argv) {
 		return cmd_results_new(CMD_FAILURE, "No current container");
 	};
 	
-	if (!container_is_floating(container)) {
-		return cmd_results_new(CMD_FAILURE,
-			"Can't set sticky on a tiled container");
-	}
-
 	container->is_sticky = parse_boolean(argv[0], container->is_sticky);
 
-	if (container->is_sticky &&
+	if (container->is_sticky && container_is_floating_or_child(container) &&
 			(!container->scratchpad || container->workspace)) {
 		// move container to active workspace
 		struct sway_workspace *active_workspace =

sway/tree/container.c

@@ -708,7 +708,6 @@ void container_set_floating(struct sway_container *container, bool enable) {
 				container->border = container->saved_border;
 			}
 		}
-		container->is_sticky = false;
 	}
 
 	container_end_mouse_operation(container);