[Webkit-unassigned] [Bug 271820] New: Disabling both underline and strikethrough break the typed text

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=271820

            Bug ID: 271820
           Summary: Disabling both underline and strikethrough break the
                    typed text
           Product: WebKit
           Version: Safari 17
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: HTML Editing
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: valentin.perignon at icloud.com
                CC: wenson_hsieh at apple.com

Created attachment 470635

  --> https://bugs.webkit.org/attachment.cgi?id=470635&action=review

Step 1 above - Step 2 below

The bug occurs on a contentEditable document when using `document.execCommand()`.

(Step 1) First we enable "underline" and "strikethrough", then type some text, it works as expected.
Then we disable both "underline" and "strikethrough".
(Step 2) When we type some text, the previous text that was underlined and crossed out looses its strikethrough property.

It is because, at the first step, the HTML looks like this:
```HTML
Coucou<u><strike>Tout</strike></u>
```
The word "Tout" is wrapped in two tags: u and strike.

But at the second step, the HTML looks like this:
```HTML
Coucou<strike style="text-decoration: underline;">Tout</strike>LeMonde

```
Juste the tag strike remains with a style attribute to apply the underline.
However, the `text-decoration: underline` override the webkit style `text-decoration-line: line-through`, so the text is just underlined.

You can refer to the attachment to see how it looks a the first and second steps.

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