[Bug 1593387] [NEW] Overlapping unicode characters with Cantarell font in Firefox 47

[Aldo Nogueira]

Public bug reported:

Certain Portuguese words like "Atualizações" or "Preferências" (meaning Updates and Preferences) are shown with the characters "õe" and "ên" overlapping, as they were only one character.
To reproduce this bug we need Firefox 47 and Cantarell regular as UI font.
My system is a Ubuntu 16.04 which was "converted" to Ubuntu Gnome installing ubuntu-gnome-desktop package.
I remember everything was fine with Firefox 46.
Switching the UI font to Ubuntu regular fixes the problem as well.
Other applications work fine: gtk2, gtk3, qt...

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Captura de tela de 2016-06-16 15-22-21.png"
   https://bugs.launchpad.net/bugs/1593387/+attachment/4685097/+files/Captura%20de%20tela%20de%202016-06-16%2015-22-21.png

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Title:
  Overlapping unicode characters with Cantarell font in Firefox 47

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