Mermaid diagram does not work inside `<details>` tag

[rijenkii]

Description

Wrapping a mermaid diagram into a <details> tag causes its height to be invalid.

To reproduce create a comment with following contents:

<details>

```mermaid
---
title: Order example
---
erDiagram
    CUSTOMER ||--o{ ORDER : places
    ORDER ||--|{ LINE-ITEM : contains
    CUSTOMER }|..|{ DELIVERY-ADDRESS : uses
```

</details>

Reproduction on demo: https://demo.gitea.com/rijenkii/tjest/issues/2.

Gitea Version

1.23.0+dev-567-g9df5ddaf44

Can you reproduce the bug on the Gitea demo site?

Yes

Log Gist

No response

Screenshots

Git Version

No response

Operating System

No response

How are you running Gitea?

Demo

Database

None