Issue with multiline fixed-width blocks

[Venemo]

MarkPad renders the following:

    ```
    line 1
    line 2
    ```

in a single line.

[kingeimho]

MarkPad renders the following:

```
line 1
line 2
```

in a single line.

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2016年7月21日 20:31於 "Timur Kristóf" notifications@github.com寫道：

MarkPad renders the following:

```
line 1
line 2
```

in a single line.

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#468, or mute the thread
https://github.com/notifications/unsubscribe-auth/ATFJ36dTYA3C-zJHdP4y9CBB3_MWXASYks5qX2a-gaJpZM4JRvnM
.

[Venemo]

I would expect it to render that in multiple lines, in the same way as it works on GitHub and other places. :)