line-number anchor lost in sign-in redirect

Summary

Links to a specific line in a file lose their line-number anchor after the user has been redirected to the sign in page.

Steps to reproduce

Take a link to a line in some file contained in a password-protected repo: https://my.gitlab.site/bad/example/blob/master/myfile#L1234 (This exact example does not work, of course. I am not sure how to give an example with a password-protected repo accessible to everybody.)

Steps to reproduce the problem(s):

1. sign out from my.gitlab.site
2. paste link in address bar
3. gitlab redirects to https://my.gitlab.site/users/sign_in#L1234
4. sign in
5. gitlab redirects to myfile, but the line number anchor is lost

What is the current bug behavior?

• in step 3 the anchor is used in the sign in page, where it is useless
• in step 5 the anchor is lost after the sign in is completed

What is the expected correct behavior?

• in step 3 the anchor is stored as redirect-after login target, but not used on the sign-in page itself
• in step 5 the anchor is included in the redirect

Results of GitLab environment info

Sorry, I cannot give more details than that the site with the problem uses GitLab Community Edition 9.1.4 fed799ae and ldap login.