* Fix error in diff html rendering
Was missing an optional whitespace check in regex. Also noticed a rare case where diff.Type == Equal would be empty and thus get a newline attached. Fixed that too.
Fixes#13177
* Update services/gitdiff/gitdiff.go
Co-authored-by: zeripath <art27@cantab.net>
* Update gitdiff_test.go
* fmt
Co-authored-by: zeripath <art27@cantab.net>