[fix] reset form in use:enhance after successful submit (#7207)

Fixes #7163

Author: dummdidumm

.changeset/rotten-trees-brush.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] reset form in use:enhance after successful submit

packages/kit/src/runtime/app/forms.js

@@ -25,6 +25,7 @@ export function enhance(form, submit = () => {}) {
 	 */
 	const fallback_callback = async ({ action, result }) => {
 		if (result.type === 'success') {
+			form.reset();
 			await invalidateAll();
 		}
 

packages/kit/test/apps/basics/test/test.js

@@ -1873,6 +1873,7 @@ test.describe('Actions', () => {
 
 		await expect(page.locator('pre.formdata1')).toHaveText(JSON.stringify({ result: 'foo' }));
 		await expect(page.locator('pre.formdata2')).toHaveText(JSON.stringify({ result: 'foo' }));
+		await expect(page.locator('input[name=username]')).toHaveValue('');
 	});
 
 	test('use:enhance abort controller', async ({ page, javaScriptEnabled }) => {