Don't trim initial markdown

[rkok]

When using diffSourcePlugin with viewmode=source, this trim() would cause MDXEditor's onChange to fire immediately. This in turn would dirty the field when used in combination with a form wrapper like react-hook-form.

I think the initial markdown does not need to be trimmed; the user should be free to initialize the editor with trailing or leading newlines as they see fit, the editor should not care.

[petyosi]

Merging this would be a breaking change. Happy to accept an optional prop to disable the trim

[rkok]

Hi @petyosi, prop is now added :+1:

[github-actions[bot]]

:tada: This PR is included in version 3.12.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: