[Bug 842568] New: Bad spacing in Liberation Mono with BCI-hinting

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=842568

            Bug ID: 842568
        QA Contact: extras-qa(a)fedoraproject.org
          Severity: unspecified
           Version: rawhide
          Priority: unspecified
                CC: fonts-bugs(a)lists.fedoraproject.org,
                    i18n-bugs(a)lists.fedoraproject.org,
                    petersen(a)redhat.com, psatpute(a)redhat.com
          Assignee: psatpute(a)redhat.com
           Summary: Bad spacing in Liberation Mono with BCI-hinting
        Regression: ---
      Story Points: ---
    Classification: Fedora
                OS: Linux
          Reporter: xously(a)gmail.com
              Type: Bug
     Documentation: ---
          Hardware: x86_64
        Mount Type: ---
            Status: NEW
         Component: liberation-fonts
           Product: Fedora

Created attachment 599962
  --> https://bugzilla.redhat.com/attachment.cgi?id=599962&action=edit
Spacing of "s"

Description of problem:

Applies to Liberation Mono with BCI-hinting.

"s" is too far to the right or left, depending on the font size. E.g.
"users"
looks like "user s" at size 11. (See first attachment for font sizes 8-16.)

"ow" is merging in bold font, at least at size 11. E.g. in
"downloads". (See
second attachment.)

Version-Release number of selected component:
2.00.0

How reproducible:

Always with this ".fonts.conf":

<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
    <match target="font">
        <edit name="antialias" mode="assign">
            <bool>true</bool>
        </edit>
    </match>
    <match target="font">
        <edit name="hinting" mode="assign">
            <bool>true</bool>
        </edit>
    </match>
    <match target="font">
        <edit name="hintstyle" mode="assign">
            <const>hintfull</const>
        </edit>
    </match>
    <match target="font">
        <edit name="rgba" mode="assign">
            <const>rgb</const>
        </edit>
    </match>
    <match target="font">
        <edit mode="assign" name="lcdfilter">
            <const>lcddefault</const>
        </edit>
    </match>
</fontconfig>

With auto-hinting enabled instead, these problems do not occur:

    <match target="pattern" name="family">
        <test name="family" qual="any">
            <string>Liberation Mono</string>
        </test>
        <edit name="autohint" mode="assign">
            <bool>true</bool>
        </edit>
    </match>

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