[mdv] getTeminatorAt recurses infinitely if template is its own terminator

pkg/mdv/test/template_element_test.dart

Index: pkg/mdv/test/template_element_test.dart
diff --git a/pkg/mdv/test/template_element_test.dart b/pkg/mdv/test/template_element_test.dart
index c1a49aa14f2e603840c8dc546c07ae2346279c47..82dc5d4e5b95d163a906b9d1fa346810414e0589 100644
--- a/pkg/mdv/test/template_element_test.dart
+++ b/pkg/mdv/test/template_element_test.dart
@@ -1349,6 +1349,25 @@ templateElementTests() {
     expect(div.nodes[3].text, 'Name: Leela');
   });
 
+  observeTest('Template - Self is terminator', () {
+    var div = createTestHtml(
+        '<template repeat>{{ foo }}'
+          '<template bind></template>'
+        '</template>');
+
+    var m = toSymbols([{ 'foo': 'bar' }]);
+    recursivelySetTemplateModel(div, m);
+    performMicrotaskCheckpoint();
+
+    m.add(toSymbols({ 'foo': 'baz' }));
+    recursivelySetTemplateModel(div, m);
+    performMicrotaskCheckpoint();
+
+    expect(div.nodes.length, 5);
+    expect(div.nodes[1].text, 'bar');
+    expect(div.nodes[3].text, 'baz');
+  });
+
   observeTest('RecursiveRef', () {
     var div = createTestHtml(
         '<template bind>'