Multiline title in flowchart subgraphs is overlapped by nodes #3806

Description

Multiline titles in flowchart subgraphs (e.g., subgraph C["multiline text"]) are overlapped by nodes.

Steps to reproduce

Check this example:

```mermaid
graph TD
    subgraph C["A process that<br>
    is generally adopted"]
        A[Christmas] -->|Get money| B(Go shopping)
    end
```

graph TD
    subgraph C["A process that<br>
    is generally adopted"]
        A[Christmas] -->|Get money| B(Go shopping)
    end

Another example with the Mermaid Live Editor

graph TD
    subgraph C["A process that
    is generally adopted"]
        A[Christmas] -->|Get money| B(Go shopping)
    end

Setup

Desktop

• OS and Version: Windows 11
• Browser and Version: Chrome Version 107.0.5304.107 (Official Build) (64-bit), Firefox 107.0 (64 bit, ...
• Mermaid v9.2.2

Additional Context

In addition, it appears that there is no possibility to control the spacing of the subgraph title text (margin, padding).