Unnecessary scroll bar when loading workspace comments

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Description

When loading a workspace comment, if adding a scroll bar can make the text overflow, the scroll bar is added - even if the text wouldn't overflow if the scroll bar wasn't there.

Reproduction steps

1. Go to https://raspberrypifoundation.github.io/blockly/packages/blockly/tests/playground.html
2. Right click and press "Add Comment"
3. Paste this into the comment:

   12345678 12345678
   12345678 12345678
   12345678 12345678
   12345678 12345678
   

4. Resize the comment to be tightly around the text
5. Press "Save JSON" (or "Save XML", but make sure that it doesn't add newlines and white spaces at the end of the comment as part of the XML formatting)
6. Press "Load"
7. The text wraps into more rows and shows a scroll bar. If you move the comment, the scroll bar disappears and the text unwraps

(the bug can also happen with word-wrapped English text where it re-wraps differently, but I think it will happen more reliably if the text is a pattern like this)

Priority

No response

Stack trace

Screenshots

comment-scroll-bar.webm

Browsers

Chrome desktop, Firefox desktop