[luatex] Enable font expansion

[Patrick Gundlach]

Hello all,

this has to do with my other problem, but I'd like to open a parallel thread. I believe that my problem is related to font expansion. So my question is:

How do I enable font expansion for a specific font (loaded with luaotfload or without)?

I have tried this, but this has almost no effect:

----------------------------------------------
\font\myfont="file:texgyreheros-regular.otf" at 10bp
\myfont
----------------------------------------------

and then this in Lua:

----------------------------------------------
tex.adjustspacing = 2

local myfont = font.id("myfont")
tbl = font.getfont(myfont)
tbl.stretch = 40
tbl.shrink = 30
tbl.step = 10
tbl.auto_expand = true

for i,v in pairs(tbl.characters) do
    v.expansion_factor = 1000
end

font.setfont(myfont,tbl)
----------------------------------------------



Patrick