Does not restore iframe size from saved html content

[dsaltares]

Summary

When using IframeExtension with the enableResizing option enabled and saving content to HTML, loading saved content does not preserve the iframe dimensions.

Steps to reproduce

1. Enable IframeExtension with enableResizing set to true.
2. Add iframe and resize it
3. Save content to html
4. Restore content from html

Expected results

The iframe size is preserved.

Actual results

The iframe size goes back to its original settings.

Possible Solution

We're parsing the iframe dimensions as strings and not as numbers. We should parse them as numbers.

Screenshot(s)

https://www.loom.com/share/45180dd87dc349a496fcd7554e20f63c

[dsaltares]

Happy to send a PR for this.