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[Igor <209256@xxxxxxxxxxxxxxxxxx>]

In Cairo there is following logic for setting the HintStyle implemented:
  if the system-wide setting (I really don't know if it is XSETTINGS Xft/HintStyle served by gnome-settings-daemon or xrdb xft.hintstyle value) contains any valid value (int = 0-3, which represent HintNone, HintSlight, HintMedium and HintFull ), this value overrides everything and will be always used by Cairo. 
  if the system-wide setting doesn't exist, the HintFull is assumed and that value will be used. 
  if the system-wide setting exists, but is not valid, the HintStyle returned by FontConfig will be used. 

I have modified the code (options represent the system-wide options object, others represents settings returned by FontConfig):
  if (options->base.hint_style == CAIRO_HINT_STYLE_DEFAULT)
    options->base.hint_style = others->base.hint_style
into
  if (others->base.hint_style != CAIRO_HINT_STYLE_DEFAULT)
    options->base.hint_style = others->base.hint_style

This way, if FontConfig has any information about Hinting of the font
that was requested, that information will be used. Otherwise Cairo uses
the default system-wide setting.

-- 
different hintstyle issue
https://bugs.launchpad.net/bugs/209256
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