bold display wrong about milkdown HOT 4 CLOSED

@Saul-Mirone I think it's not just bold display wrong, it's all toggleMark
And we can't undo it to get it back to normal display, we'll fixing it?

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This issue should be split into 2 different problems:

1. When user typing *hello *hello, you will not get bold style because that's how markdown spec defines the behavior.
   *hello *hello -> *hello *hello. It's same in github's editor.
2. Users cannot undo the behavior. That's a bug and I'll fix it.

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@Saul-Mirone
**bold ** bold this is a wrong markdown format
As you can see from the video I shared, when I type strong testing and set it to bold, it is fine
But when I want to cancel testing blod, it appears in the wrong format, **strong testing** -> **strong **testing
That's not correct, right? It should be **strong** testing

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Fixed by #1171

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