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[Fred-wang <1502701@xxxxxxxxxxxxxxxxxx>]

FYI, more people reported this issue when reading Wikipedia pages on
Ubuntu:

https://bugzilla.mozilla.org/show_bug.cgi?id=1220465#c2
https://phabricator.wikimedia.org/T122400


** Bug watch added: Mozilla Bugzilla #1220465
   https://bugzilla.mozilla.org/show_bug.cgi?id=1220465

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https://bugs.launchpad.net/bugs/1502701

Title:
  The USE_TYPO_METRICS flag is not set in the OS/2 table of Latin Modern
  Math

Status in lmodern package in Ubuntu:
  New
Status in lmodern package in Debian:
  Fix Released

Bug description:
  Dear Maintainer,

  lmodern contains version 1.950 of the modern font. In this version,
  the USE_TYPO_METRICS flag is not set in the OS/2 table of Latin Modern
  Math, which can lead to excessive line spacing. See
  http://www.microsoft.com/typography/otspec/os2.htm#fss

  This bug is fixed upstream, please upgrade to version 1.959:
  http://www.gust.org.pl/gustnews/news02-05-10-2014en

  This bug is also fixed in Debian:
  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=799731

  
  [ Rationale: Starting with Gecko 31, the typo metrics are used when either USE_TYPO_METRICS is set or the font contains a MATH table. However, starting with Gecko 43, it will only be used when USE_TYPO_METRICS is explicitly set:
  https://bugzilla.mozilla.org/show_bug.cgi?id=947650#c0
  https://bugzilla.mozilla.org/show_bug.cgi?id=1170782
  https://bugzilla.mozilla.org/show_bug.cgi?id=1208776#user_story_readonly  ]

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