Glyph extents

[Jean Abou Samra]

I'm trying to understand how glyph extents (are supposed to) work, and having a 
hard time.
Here is an example difference that leaves me scratching my head:
\version "2.25.4"

\markup \override #'(box-padding . 0) \overlay {  
  \with-color "red" \box \dynamic "f"  
  \with-color "blue" \box \musicglyph "f"  
}



As you can see, whether the forte glyph is loaded through 
Open_type_font/fetaMusic or Pango_font/fetaText makes a difference in its 
vertical extents.

Does anyone see a good reason for that? Does anyone have an idea why it happens?

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