Block Comments: use TextareaAutosize for comment field

[adamsilverstein]

What?

Makes the comment input resize to the contained text.

Closes: #71425

Why?

Currently the comment box has a fixed size. Instead, the textarea should scale to the contained comment text with a minimum size similar to the current display.

How?

Use the TextareaAutosize component.

Testing Instructions

1. make sure inline commenting experiment is enabled
2. leave a comment that is much larger than the input box

expected results:
The text area should expand to show the full text.

Testing Instructions for Keyboard

same

[Mamaduka]

I wish field-sizing had better browser support so that we could drop JS hacks.

[github-actions]

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[Mamaduka]

I think rebasing went bit crazy 😅

[adamsilverstein]

I think rebasing went bit crazy 😅

Yeah, I noticed. oops, not sure what happened! I'm going back to my usual pattern of merging trunk until I figure that out. I was just asking you about it in the other thread.

[adamsilverstein]

I think rebasing went bit crazy 😅

Fixed the branch, ready for review again @Mamaduka.

[Mamaduka]

Thanks, @adamsilverstein!

Did you figure out what the reason was?

[adamsilverstein]

Did you figure out what the reason was?

@Mamaduka I think what happened is I was resolving conflicts when rebasing on trunk, then inadvertently pushed the branch while still in the unresolved state. To fix the issue I aborted the rebase, did the rebase again completing it this time and force pushed.