fix(rrdom): Ignore invalid DOM attributes when diffing (#213)

We encountered an issue where replays with invalid attributes (e.g.
`@click`) would break rendering the replay after seeking. The exception
bubbles up to
[here](https://github.com/rrweb-io/rrweb/blob/62093d4385a09eb0980c2ac02d97eea5ce2882be/packages/rrweb/src/replay/index.ts#L270-L279),
which means the replay will continue to play, but the replay mirror will
be incomplete.

Closes getsentry/team-replay#458

packages/rrdom/src/diff.ts

@@ -328,7 +328,16 @@ function diffProps(
         }
       };
     } else if (newTree.tagName === 'IFRAME' && name === 'srcdoc') continue;
-    else oldTree.setAttribute(name, newValue);
+    else {
+      try {
+        oldTree.setAttribute(name, newValue);
+      } catch (err) {
+        // We want to continue diffing so we quietly catch
+        // this exception. Otherwise, this can throw and bubble up to
+        // the `ReplayerEvents.Flush` listener and break rendering
+        console.warn(err);
+      }
+    }
   }
 
   for (const { name } of Array.from(oldAttributes))

packages/rrdom/test/diff.test.ts

@@ -336,6 +336,32 @@ describe('diff algorithm for rrdom', () => {
       expect((node as Node as HTMLElement).className).toBe('node');
     });
 
+    it('ignores invalid attributes', () => {
+      const tagName = 'DIV';
+      const node = document.createElement(tagName);
+      const sn = Object.assign({}, elementSn, {
+        attributes: { '@click': 'foo' },
+        tagName,
+      });
+      mirror.add(node, sn);
+
+      const rrDocument = new RRDocument();
+      const rrNode = rrDocument.createElement(tagName);
+      const sn2 = Object.assign({}, elementSn, {
+        attributes: { '@click': 'foo' },
+        tagName,
+      });
+      rrDocument.mirror.add(rrNode, sn2);
+
+      rrNode.attributes = { id: 'node1', class: 'node', '@click': 'foo' };
+      diff(node, rrNode, replayer);
+      expect((node as Node as HTMLElement).id).toBe('node1');
+      expect((node as Node as HTMLElement).className).toBe('node');
+      expect('@click' in (node as Node as HTMLElement)).toBe(false);
+      expect(warn).toHaveBeenCalledTimes(1);
+      warn.mockClear();
+    });
+
     it('can update exist properties', () => {
       const tagName = 'DIV';
       const node = document.createElement(tagName);