Write new text in multiple formats

[Tug]

Describe the bug
It's currently not possible to write bold and italic text (or any other combination).

To Reproduce
Steps to reproduce the behavior:

1. Go to the editor in visual mode
2. Create an empty paragraph block
3. See the block toolbar is not visible yet (1)
4. Write something so the block toolbar becomes visible
5. Select bold and italic and start typing again
6. Notice you're typic in italic, not bold italic (2)
7. Notice nor bold nor italic is marked as active (3) while you write in italic
8. Write a word in bold at the end of your text then place your cursor at the beginning of the bold text.
9. Start typing in the current format, notice bold is selected even though you're typing without formatting (4)
10. Click on bold to start typing in bold and notice the formatting on the bold word you added is removed (5)

Expected behavior
You should be typing in bold italic and both format should be selected while you type.
Imo, we should probably use the previous character's format to determine the active format.

Screenshots

Desktop:

• OS: macos
• Browser Chrome
• Version 71.0.3578.98

Additional context

• See the mobile effort to address those problems: Use format-library in gutenberg-mobile #12249
  cc @hypest @gziolo

[gziolo]

It's a known issue. It duplicates #11091. Does this issue is also transferred to the mobile app? It would be nice to identify whether it is related to TinyMCE or the way we manage the internal representation of rich text component.

Let's discuss in #11091. I'm closing this one.

[koke]

I assume you meant #11091?

[gziolo]

Yes, I updated my comment.