Tilde code blocks preview issue

[pbek]

@Waqar144, as follow up from #2670 another edge-case...

~~~
```ini
test1=test2
```
~~~

The html from the other code block is visible. 😅

[Waqar144]

if you invert the order it will work I think.

Unlikely that I will fix this though, finding context properly is not simple