Issue with pango font tree and global staff size

[TaoCG]

Dear list,

I am having a problem with using a custom pango font tree and
set-global-staff-size at the same time.
If I set the staff size before the \paper block only the staff lines change,
the feta glyphs and text don't.
But if I set the staff-size after the \paper block it resets the pango font
tree to the default lily fonts.

I made two snippets for demonstration. Both tested with 2.14.2 and 2.15.39
with the same results.


%%%%%
% 1.ly
%%%%%

music = { a4^"Markup" b c' d' }

\paper
{
        #(define fonts
                (make-pango-font-tree
                        "Linux Libertine"
                        "Linux Biolinum"
                        "Courier New"
                        (/ 20 20)))
}

#(set-global-staff-size 15)

\score
{
        << \new Staff \music >>
        \layout { }
}


%%%%%
% 2.ly
%%%%%

#(set-global-staff-size 15)

music = { a4^"Markup" b c' d' }

\paper
{
        #(define fonts
                (make-pango-font-tree
                        "Linux Libertine"
                        "Linux Biolinum"
                        "Courier New"
                        (/ 20 20)))
}

\score
{
        << \new Staff \music >>
        \layout { }
}

http://old.nabble.com/file/p33948694/1.png 1.png 
http://old.nabble.com/file/p33948694/2.png 2.png 
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