fix(wasm): double-click-selecting a textblock would bleed into other textblocks

[ramezgerges]

GitHub Issue (If applicable): closes #13440, closes https://github.com/unoplatform/Uno.Themes/issues/1459

PR Type

What kind of change does this PR introduce?

What is the current behavior?

What is the new behavior?

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] Docs have been added/updated which fit documentation template (for bug fixes / features)
• [ ] Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• [ ] Validated PR Screenshots Compare Test Run results.
• [ ] Contains NO breaking changes
• [ ] Associated with an issue (GitHub or internal) and uses the automatic close keywords.
• [ ] Commits must be following the Conventional Commits specification.

Other information

Internal Issue (If applicable):