Unfortunately some of the suggested changes to #12095 introduced
bugs which due to caching behaviour of sharedworkers were not caught
on simple tests.
These are as follows:
* Changing from simple for loop to use includes here:
```js
register(port) {
if (!this.clients.includes(port)) return;
this.clients.push(port);
port.postMessage({
type: 'status',
message: `registered to ${this.url}`,
});
}
```
The additional `!` prevents any clients from being added and should
read:
```js
if (this.clients.includes(port)) return;
```
* Dropping the use of jQuery `$(...)` selection and using DOM
`querySelector` here:
```js
async function receiveUpdateCount(event) {
try {
const data = JSON.parse(event.data);
const notificationCount = document.querySelector('.notification_count');
if (data.Count > 0) {
notificationCount.classList.remove('hidden');
} else {
notificationCount.classList.add('hidden');
}
notificationCount.text() = `${data.Count}`;
await updateNotificationTable();
} catch (error) {
console.error(error, event);
}
}
```
Requires that `notificationCount.text()` be changed to use `textContent`
instead.
Signed-off-by: Andrew Thornton <art27@cantab.net>