Improvement for mermaid.live: Copy-paste indented content results in incorrect indentation

[lilian-lilifox]

Description

Sometimes, we got the code written on other application, and we would copy the code and paste it in the webpage.
Then we can find that each line with indentation, get another unexpected redundant indentation than the line above, and the indentation become more and more in the flowing lines.
Same problem can be found in vim or vs code if the setting is not proper.

Steps to reproduce

When I use mermaid.live with my firefox on linux, if I paste code with indentation, it will happen.
And I had tested chrome, things didn't happened.

Screenshots

Code Sample

No response

Setup

• Mermaid version: 10.9.1
• Browser and Version: Mozilla Firefox 126.0.1

Suggested Solutions

No response

Additional Context

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