[Fedora-i18n-bugs] [Bug 1374074] New: 1px changes in line height from bold <-> non-bold breaks various websites

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1374074

            Bug ID: 1374074
           Summary: 1px changes in line height from bold <-> non-bold
                    breaks various websites
           Product: Fedora
           Version: 24
         Component: liberation-fonts
          Severity: high
          Assignee: psatpute(a)redhat.com
          Reporter: jonas(a)thiem.email
        QA Contact: extras-qa(a)fedoraproject.org
                CC: fonts-bugs(a)lists.fedoraproject.org,
                    i18n-bugs(a)lists.fedoraproject.org,
                    petersen(a)redhat.com, psatpute(a)redhat.com



Description of problem:
The liberation fonts as packaged in Fedora can change line height by 1px as
reported by fontconfig if switched from bold to non-bold or vice versa.

This can break various sites displayed in web browsers, and for example all
gitlab code listings viewed on Fedora only (works fine on Ubuntu, Archlinux,
...) aren't lining up properly because of this with the line numbers, which
makes the whole thing look like a big mess. A more detailed analysis can be
found here: https://bugzilla.mozilla.org/show_bug.cgi?id=1296856

Please note I'm not sure who is the best involved party to fix this and whether
e.g. the website should fix it on their side, however I tried playing around
with CSS line-height and so far I didn't manage to make it line up myself in
the affected configurations (but I'm no CSS expert). Therefore I'm filing a bug
here as well, hoping some font expert can shed some light on the issue.

There is also a firefox bug report here:
https://bugzilla.mozilla.org/show_bug.cgi?id=1296856
There is also a gitlab bug report here:
https://gitlab.com/gitlab-org/gitlab-ce/issues/20202



Version-Release number of selected component (if applicable):
Version     : 1.07.4
Release     : 7.fc24

How reproducible:
100% at affected font sizes

Steps to Reproduce:
1. Run an affected configuration (Firefox Nightly on Fedora should work,
possibly also regular Firefox stable as packaged in Fedora) at an affected web
browser zoom level (100%/standard should work for firefox)
2. Visit a gitlab source code listing of more than just ~10 lines, e.g.
https://gitlab.com/gitlab-org/gitlab-ce/blob/master/app/controllers/group...
3. Look how line numbers and lines match up

Actual results:
Line numbers are not matching up

Expected results:
Line numbers are matching up

Additional info:

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