Multiline XML opening tag is not escaped

[titovmx]

Describe the bug

The editor loses XML/HTML tags if the opening tag is written in a few lines.

To Reproduce

Steps to reproduce the behavior:

1. Go to https://ui.toast.com/tui-editor
2. Open WYSIWYG tab
3. Paste the following XML:

<Block
  orderId='abc'>
<Block/>

4. Switch to Markdown and back
5. The opening tag is grey on Markdown tab and disappeared after switching back to WYSIWYG mode.

Expected behavior

I want to see the same XML

Screenshots

Desktop:

• OS: Mac OS v12.4
• Browser: Chrome 123.0.6312.87

Additional context

When the opening tag is written in one line it is properly escaped.
The closing tag is also properly escaped in this example.