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Backport #23702 by @jpraet Fixes #23701, #23515. Alternate approach to #23604 using CSS scroll-margin-top, which is also taken into account for direct links to files in a diff: * On the PR diff, this currently shows the previous file first: https://try.gitea.io/jpraet/test/pulls/13/files#diff-b94d08b409f9d05fb65b6cccaf7b3e4ecc7cc333 * On the commit diff, the first line of the linked file is currently under the sticky header: https://try.gitea.io/jpraet/test/commit/1a19e6b14e31d295b7372f3346580c3e85690ff5#diff-b94d08b409f9d05fb65b6cccaf7b3e4ecc7cc333 Co-authored-by: Jimmy Praet <jimmy.praet@ksz-bcss.fgov.be>