put intro stuff on scheduler, not root

src/internal/SvelteComponent.js

@@ -1,4 +1,4 @@
-import { schedule_update, flush } from './scheduler.js';
+import { schedule_update, flush, intro } from './scheduler.js';
 import { set_current_component } from './lifecycle.js'
 import { run_all } from './utils.js';
 import { blankObject } from './utils.js';
@@ -35,10 +35,10 @@ export class SvelteComponent {
 		this.$$fragment = this.$$create_fragment(this, this.$$.get_state());
 
 		if (options.target) {
-			this.$$intro = false; // TODO can we put this in the scheduler instead?
+			intro.enabled = false;
 			this.$$mount(options.target);
 			flush();
-			this.$$intro = true;
+			intro.enabled = true;
 		}
 	}
 

src/internal/scheduler.js

@@ -3,6 +3,8 @@ let update_scheduled = false;
 const dirty_components = [];
 const after_update_callbacks = [];
 
+export const intro = { enabled: false };
+
 export function schedule_update(component) {
 	dirty_components.push(component);
 	if (!update_scheduled) {