Deep linking a specific line of code in a PR hides the line after page load

[ChrisN-transnexus]

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If I click on the left side of a diff within a PR (the darker green/pink area), the browser's URL is updated with a hash which is supposed to link directly to the line which was clicked, EG: https://{repo URL}/pull/79/files#diff-a010b816a9f61daed69cb4fb1f11d416cf4bca65f4244e16334d15daf2b01c42R9

The purpose of this hash is to allow the user to share the link with a coworker so their browser can be taken directly to the line of code being discussed. However, once the URL is copy/pasted into a browser, the page scrolls to the line in question, then the "floating" grey file name header covers the highlighted line, creating a confusing experience and defeating the purpose of deep linking a specific line of code.

The team which created the "floating" file name header clearly did not account for deep linking a specific line of code, and did not test for this experience. This is confusing for the person receiving the deep link URL and makes the user who sent the deep link look dumb. It should be fixed, and only needs a simple change to scroll the page roughly 40px less when viewing a deep link in a PR.

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