List Block: Do not split on line breaks when multiple blocks are transformed

[ellatrix]

Description

Title should be clear. It doesn't make so much sense to create a list item for every line in a paragraph if multiple paragraphs are transformed. Let's only do that when transforming one.

How has this been tested?

Screenshots

Types of changes

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.

[jorgefilipecosta]

LGTM 👍 I verified that if we transform a single paragraph with multiple lines into a list we get multiple list items. If we transform multiple paragraphs into a list we get a list item per paragraph instead of a list item per new line as before.

[ellatrix]

Thanks for the quick review @jorgefilipecosta!