xwayland: handle floating configure request size

This makes it so the container gets resized by a configure request for
xwayland floating views. The minimum and maximum sizes are also
respected. Previously, the configure request was resizing the surface
to the size requested, but never changing the container size. This
caused the surface to be rendered outside of the container or to be
smaller than the container. The former is never ideal and the latter
makes no sense for floating views since the container itself can just
be shrunk.

sway/desktop/xwayland.c

@@ -432,8 +432,16 @@ static void handle_request_configure(struct wl_listener *listener, void *data) {
 		return;
 	}
 	if (container_is_floating(view->container)) {
-		configure(view, view->container->current.content_x,
-				view->container->current.content_y, ev->width, ev->height);
+		// Respect minimum and maximum sizes
+		view->natural_width = ev->width;
+		view->natural_height = ev->height;
+		container_init_floating(view->container);
+
+		configure(view, view->container->content_x,
+				view->container->content_y,
+				view->container->content_width,
+				view->container->content_height);
+		node_set_dirty(&view->container->node);
 	} else {
 		configure(view, view->container->current.content_x,
 				view->container->current.content_y,