Collapse AsSpan().Slice(...) into .AsSpan(...)

[tarekgh]

Fixes #27330

[tarekgh]

CC @stephentoub @KrzysztofCwalina @atsushikan

[stephentoub]

There's a lot of unrelated whitespace changes in the PR. Other than that, LGTM.

[tarekgh]

There's a lot of unrelated whitespace changes in the PR

Yes, I prefer setting my editor to remove the white spaces at the end of the lines. by the way, if you use code flow would be easier to see the actual changes and ignoring the space differences.

thanks for your review.

[stephentoub]

by the way, if you use code flow would be easier to see the actual changes and ignoring the space differences.

Or just adding ?w=1 to the url in the browser, which is what I did.

[stephentoub]

Yes, I prefer setting my editor to remove the white spaces at the end of the lines.

Ok. It'd be nice in the future if such widespread changes were isolated to their own commit or PR. Just helps with understanding why changes are being made, as well as when reviewing.