1547743 - Helvetica matches to "DejaVu Sans" instead of "Liberation Sans" on Ubuntu 18.04

Status: NEW

(Core :: Layout: Text and Fonts, defect, P3)

Description

[Jeff Muizelaar [:jrmuizel]]

Attachment: test.html

Running fc-match Helvetica correctly gives "Liberation Sans" so it seems like there's something that Firefox is doing wrong. Chrome also correctly uses "Liberation Sans".

Comment 1

[Jeff Muizelaar [:jrmuizel]]

Any thoughts as to why this would be happening Jonathan?

Comment 2

[Jonathan Kew (:jfkthame)]

More information needed: we'd need to look at the fontconfig rules that are present on the system. What specifies that Liberation Sans should be used to satisfy a request for Helvetica?

Comment 3

[Jeff Muizelaar [:jrmuizel]]

It looks like it's the following rules:

        <alias>
          <family>Helvetica</family>
          <default>
          <family>Arial</family>
          </default>
        </alias>

        <alias binding="same">
          <family>Arial</family>
          <accept>
            <family>Arimo</family>
            <family>Liberation Sans</family>
            <family>Albany</family>
            <family>Albany AMT</family>
          </accept>
        </alias>

from https://github.com/behdad/fontconfig/blob/master/conf.d/30-metric-aliases.conf

Comment 4

[Jonathan Kew (:jfkthame)]

Huh, interesting. Looks like maybe we don't follow the multiple levels of aliasing properly. Has it always behaved like this, or is this a regression?

Comment 5

[Jeff Muizelaar [:jrmuizel]]

I have no idea if this is a regression or not.

Comment 6

[Jonathan Kew (:jfkthame)]

We'll need to re-implement some of the fontconfig integration stuff anyhow to work with the cross-process font list from bug 1514869, so maybe we can handle this better there.