Change styles dropdown behavior for enabling styles

[scofalik]

📝 Provide a description of the improvement

Originally reported in + context: https://github.com/ckeditor/ckeditor5/pull/12160#issuecomment-1237246940

Currently, styles dropdown works as follows:

1. Enabled styles are styles that can be selected from the dropdown (and -- by assumption -- applied).
2. Enabled styles are taken only from the first selected block element and all its ancestors.
3. If a selection spans over bigger chunk of content, the enabled styles might be confusing:
   1. For example, let's say you have a mix of headings + paragraphs.
   2. Only heading styles are enabled as the first element is heading.
   3. Applying heading style won't have an effect on paragraphs.
   4. If you wanted to change paragraphs styles, you can't do this.
   5. You may wonder, why headings styles (not applicable to paragraphs) are enabled but paragraph styles (not applicable to headings) are not?
4. Current solution is the worst of two worlds: it's neither precise nor flexible.

I propose two solutions:

1. Enable all styles that are applicable to any of the selected elements. This one I like more. You can Ctrl + A and transform all paragraphs to given style and you won't be limited by having heading as the first element. I like this one more.
2. Enable only styles that are applicable to all of the selected elements. This is more precise. Non-applicable styles cannot be chosen anymore, so you won't be confused that part of the selection didn't change after applying a style. But in reality, if you select multiple elements, in most cases all block styles will be disabled. This is why I don't like this solution.

[oleq]

I agree that the current UX is confusing. I also suppose this is closely related to #11579.

I propose two solutions:

We may consider either of these as a quick fix.

Honestly though, I'd rather make the feature able to rename elements in the model and act like style feature in almost any popular desktop text processor. For instance, you could select [ heading, paragraph, image, paragraph ] choose "Fancy paragraph" and turn it all into [ fancy paragraph, fancy paragraph, image, fancy paragraph ] retaining the content inside. That would require a lot of work, though.

[scofalik]

☝️ I agree with you. I thought it was a product decision that we do not want to rename elements.

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