bug(rich-text) Extra line inserted when advancing past code block to following HR element

[yellis]

Describe the bug
In rich text mode, having an horizontal rule after a source fence, if you move the cursor down ↓ it visually pushes the

---

down one line each time you go over it.

There is also no way to get beneath the HR element when it is the last element in the doc.

To Reproduce

1. MD mode, enter this text:

```
text in fence
```
---

2. Switch to RT mode. Click in text, then down arrow
3. Observe, a new line is inserted
   

Root cause is not that you cant get past the HR in RT mode, since when there is more text beneath it, the link still appears.

Expected behavior
Should be able to move beyond the HR to go past it, the way that can be done when it is preceded by regular text and not a fenced code block

Desktop (please complete the following information):
Windows 11 Chrome 103

Additional context
https://meta.stackexchange.com/a/380438/51

[KyleMit]

Can also repro with just an empty block, not just restricted to hr as the next element.

Here's me just hitting up-arrow / down-arrow in and out of a code block

.

[alexwarren]

This was fixed by #383