Multiline custom block in react

[rnovacek]

Describe the bug

Is it possible to implement custom block in react that would handle multiline in the same way as for example Paragraph? I want to create a "Blockquote" component, that would behave the same as Paragraph, but it should show solid left border to mark quoted text.

The Shift+Enter shortcut to insert a line break doesn't work for me.

Demo: https://stackblitz.com/edit/github-v7ssmz9n?file=App.tsx

To Reproduce
Create a simple react component. Then press Shift+Enter to get a new line. Nothing will happen. I was expecting a line break.

Misc

• Node version: v18.20.3 and v20.9.0
• Package manager: npm
• Browser: chrome
• I'm a sponsor and would appreciate if you could look into this sooner than later 💖