bug#20628: 25.0.50; Incorrect line height for some fonts

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Oleh Krehel <ohwoeowho@gmail.com>,  clement.pitclaudel@live.com,  
> 20628@debbugs.gnu.org
> Date: Fri, 22 May 2015 11:27:45 -0400
> 
> > And the fields of ft_face seem to be set by FreeType library, via the
> > call to FT_Set_Pixel_Sizes, a few lines before the above snippet.
> 
> Could it be that the difference between Emacs and things like GEdit is
> that we request the ascent/descent of the whole font, whereas GEdit
> requests this data on a glyph-by-glyph basis?

_Is_ there such a thing as glyph-specific ascent and descent values?