[Webkit-unassigned] [Bug 213039] New: <hr> cannot be selected within a contenteditable

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=213039

            Bug ID: 213039
           Summary: <hr> cannot be selected within a contenteditable
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: DOM
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: kenlimmj+webkit at gmail.com

Created attachment 401563

  --> https://bugs.webkit.org/attachment.cgi?id=401563&action=review

Minimum repro case of a <hr> inside a <p> element in a contenteditable

See attached min. repro. When a `<hr>` element is placed inside a `<p>` element, it is hoisted out of the encapsulating element, and it does not seem to be possible to make a selection over the `<hr>` element in the content editable.

Steps to reproduce:

1. Place the caret at the end of "Paragraph 1"
2. Keyboard navigate over to "Paragraph 2" (right arrow key a few times in a LTR context)

Actual Results:

Cursor first moves to an empty `<p>` element, skips over the `<hr>` element, then moves to a second `<p>` element, before ending up at "Paragraph 2".

The `<hr>` element that was originally encapsulated in the `<p>` element is now hoisted out to become:

```
<p></p>
<hr>
<p></p>
```

Note this hoisting appears to happen regardless of whether everything is inside a contenteditable.

Expected Results:

Cursor should move to before the `<hr>` element, then after, i.e. offset 0 within the encapsulating `<p>` element, followed by offset 1 within the same `<p>` element.

The `<hr>` element should remain wrapped inside the `<p>` element, i.e.

```<p><hr></p>```

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