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Check validity of new.range too (#12781)

I'm not certain yet how it could be invalid, but we are still seeing
panics here.

Release Notes:

- Fixed a panic when opening the diagnostics view
6fa6e0718cConrad Irwin committed on 6/7/2024, 5:48:23 PM· committed by GitHubparent834089f
1 file changedLine totals unavailable