MutationObservers not able to observe() after disconnect()

[dtabuenc]

Describe the bug

I'm not sure why but this commit 9a64097 added a new #destroyed field in the MutationObserverClass that is set to true on disconnect and then disallows observe to be called after disconnect:

As per the specification:

The MutationObserver method disconnect() tells the observer to stop watching for mutations.

The observer can be reused by calling its observe() method again.

To Reproduce
Steps to reproduce the behavior:

1. Create a new MutationObserver instance
2. call .observe() method on it with appropriate parameters
3. call .disconnect() method on instance to stop observing
4. call.observe() again

Expected behavior
After disconnecting and observing again the mutation observer callback should continue to be called

[capricorn86]

Thank you for reporting @dtabuenc! 🙂

I believe that the bug has been fixed now.