Update on forcing autohinting per font

[Kevin Kofler <kevin.kofler@xxxxxxxxx>]

Hi,

it was noticed in https://bugzilla.redhat.com/show_bug.cgi?id=705348 that the 
most straightforward way to force autohinting for a particular font:

<match target="font">
  <test name="family" compare="eq">
    <string>Your Font</string>
  </test>
  <edit name="autohint" mode="assign">
    <bool>true</bool>
  </edit>
</match>

MAY CAUSE PROBLEMS in Qt applications (more precisely, force autohinting also 
for other fonts which should use the bytecode interpreter), especially if your 
font is one of the fonts pulled in for locale coverage (e.g. the Lohit fonts).

Instead, the following snippet is safe to use:

<match target="font">
  <test qual="first" name="family" compare="eq">
    <string>Your Font</string>
  </test>
  <edit name="autohint" mode="assign">
    <bool>true</bool>
  </edit>
</match>

Note the added qual="first" attribute. Please ALWAYS USE THIS QUALIFIER when 
forcing autohinting for a specific font.

(I wasn't aware of this issue myself before this bug report came up. Thanks to 
Akira Tagoh for the qual="first" fix.)

        Kevin Kofler
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