Conversion support when copy/pasting Markdown into the editor.

[kopepasah]

During last weeks #core-editor Dev chat there was a little discussion about Markdown and even mention of having a Markdown block. In addition, #71 mentions adding keyboard support for some "Markdown-esque shortcuts/syntactic sugar".

However, I believe support for Markdown should go beyond just one block, especially in the case writers copy/pasting Markdown into the editor (no to mention copy/pasting from other editors, like Word).

So, for example, if a writer pastes the following into the editor:

## Super Cool h2

would be cool if the editor converted this to:

<!-- wp:core/heading -->
<h2>Super cool h2.</h2>
<!-- /wp:core/heading -->

[kopepasah]

Also, when typing Markdown into the text portion of the Editor, it is converted from:

## There is something funny.

- Hello there my friend.
- Lots of love.

### Heading 3

to

<!-- wp:core/freeform -->
## There is something funny. - Hello there my friend. - Lots of love. ### Heading 3
<!-- /wp:core/freeform -->

Which causes the Markdown module in Jetpack to output everything as an h2.

[aduth]

Related: Formatting shortcuts

[jasmussen]

Also related:

• The Newline is the Commandline Inserting blocks with the keyboard alone #834
• Keyboard Support: Keyboard shortcuts support #71

[mtias]

This has been mostly implemented. If there are remaining items to handle, let's open individual issues.