fix: Continue traversing a non-self-closing element's children (#12175)

* add failing test

* continue to traverse children of `Element` types

* fix test

* changeset

.changeset/smart-donkeys-destroy.md

@@ -0,0 +1,5 @@
+---
+'svelte-migrate': patch
+---
+
+fix: continue traversing the children of non-self-closing elements

packages/migrate/migrations/self-closing-tags/migrate.js

@@ -164,6 +164,7 @@ export async function remove_self_closing_tags({ preprocess, parse }, source) {
 					SVGElements.includes(node.name) ||
 					!/^[a-z0-9_-]+$/.test(node.name)
 				) {
+					next();
 					return;
 				}
 

packages/migrate/migrations/self-closing-tags/migrate.spec.js

@@ -20,7 +20,8 @@ const tests = {
 	'<svelte:options namespace="foreign" /><foo />': '<svelte:options namespace="foreign" /><foo />',
 	'<script>console.log("<div />")</script>': '<script>console.log("<div />")</script>',
 	'<script lang="ts">let a: string = ""</script><div />':
-		'<script lang="ts">let a: string = ""</script><div></div>'
+		'<script lang="ts">let a: string = ""</script><div></div>',
+	'<div><i/></div>': '<div><i></i></div>'
 };
 
 for (const input in tests) {