The legacy M.core.event.BLOCK_CONTENT_UPDATED event has been replaced with a
new core_block/events::blockContentUpdated native DOM event.

The new event can be triggered using the `notifyBlockContentUpdated`
event, and by providing the HTMLElement that was updated, for example:

```
import {notifyBlockContentUpdated} from 'core_block/events';

const someHandler = e => {
    // ...
    const updatedBlock = e.target.closest('.block');
    notifyBlockContentUpdated(updatedBlock);
};
```

The new event can be listened to at any point in the DOM using the
following syntax:

```
import {eventTypes} from 'core_block/events';

const handler = e => {
    // The block that was updated.
    e.target;

    // The id of the updated block.
    e.detail.instanceId;
};

document.addEventListener(eventTypes.blockContentUpdated, handler);
```

A backward-compatabibility layer is included to ensure that any legacy
YUI event listener is still called with the same arguments.

This legacy bridges will be removed after Moodle 4.3.