Block autoformat could work in all kind of blocks

[Reinmar]

📝 Provide a description of the improvement

So, right now when you're in at the beginning of a heading 2 and type ### it is not going to change it to a heading 3. It's only possible to turn a paragraph into other types of blocks.

This means that you can't easily toggle between block types. Also, if you made a mistake, you need to get back to a paragraph (e.g. by undoing) and only then you can use autoformatting.

One example of an application where you can always switch between block types is Notion and I use this quite a lot. Especially when I'm changing heading levels (cause I'm reorganizing a document).

Another aspect is that currently you can only apply autoformatting to an empty block. We'd also like to apply formatting for blocks that have some content in it, as long as your cursor is at the beginning of the line.

Related issue:

• It should be possible to convert a heading into a list item and vice versa

cc @jodator @panr @oleq

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[jodator]

One example of an application where you can always switch between block types is Notion and I use this quite a lot. Especially when I'm changing heading levels (cause I'm reorganizing a document).

After using this app for some time I feel that this is the expected way of doing things. IIRC I just used this app this way (might be a hint from a tutorial). It feels natural. Even so, then when testing our implementation of block autoformat it felt weird in that regard.

ps.: This change shouldn't be a time consuming one.

[ma2ciek]

Note also that Notion allows you to remove the current formatting by typing backspace at the beginning of the line, which I also find intuitive. In the CKEditor 5 you're deleting the whole line in case of heading / blockquote. Though, this might be releated to how our features are implemented.

@mlewand edit: Make sense, but that's a separate feature request: #7517

Also, all block auto formatting should work with some text present in the line already - I can't find the proper ticket about this issue.

@mlewand edit: The closest ticket I was able to find was #2392

[Reinmar]

Note also that Notion allows you to remove the current formatting by typing backspace at the beginning of the line, which I also find intuitive. In the CKEditor 5 you're deleting the whole line in case of heading / blockquote. Though, this might be releated to how our features are implemented.

I like this behaviour of Notion but it works there because each block is a separate entity. In our cases it would be less intuitive.

But the thing that I miss and we could definitely have is that pressing backspace in the first line of the editor should reset the format to paragraph.

[Reinmar]

We did a quick review of the block autoformat code and there are a couple of things that might be worth at least considering when working on this:

• Reading model element names from the schema.
• Naming.
• isTyping.
• Not limitting this to paragraph with just one child (e.g. inline widgets, soft breaks, etc.).
• Check if autoformat could use TextWatcher (refactor) #2400