Fenced code block renders incorrectly

[rootkea]

Hello!

This is the markup text I entered in Element:

```
include <bits/stdc++.h>
using namespace std;

void bubbleSort(int arr[], int n)
{
	int i, j;
	for (i = 0; i < n-1; i++)
	for (j = 0; j < n-i-1; j++)
		if (arr[j] > arr[j+1])
			swap(&arr[j], &arr[j+1]);
}
```

And this is the o/p I get:

I expected the o/p to have same indentation as that of above markup text with syntax highlighting.

Version information

• Platform: web (in-browser)

For the web app:

• Browser: Firefox 90.0 (64-bit)
• OS: Ubuntu 20.04.2 LTS
• URL: app.element.io

[robintown]

Duplicate of #18365