Preserving <br> tags and copying and pasting selections

[divporter]

What we are attempting to achieve is retaining line breaks in the HTML that Quill produces without sacrificing other functionality.

Steps to Reproduce

1. Add the following override to Quill

class BreakBlock extends Block {
  static tagName = 'DIV'
  html(): string {
    // This prevents <br /> tags from being removed when calling getSemanticHTML()
    return this.domNode.outerHTML
  }
}
Quill.register(BreakBlock, true)

2. Add some text with multiple words to the editor (eg My text)
3. Copy the word "My"
4. Press enter to add a line break
5. Paste

Expected behaviour

Content to look like

My text
My

Actual behaviour

Content looks like

My text
My text