[luatex] font expansion and parshape

[Patrick Gundlach]

Dear experts,


my observation is that font expansion and parshape don't (didn't) play well together, is that correct?

I use a very old version of LuaTeX (0.79) and break the paragraph by calling tex.linebreak(). I also set 

    f.stretch       = 40
    f.shrink        = 30
    f.step          = 10
    f.auto_expand   = true

on the fonts. When the parameter on the second option of tex.linebreak() has a parshape table, (left margin 0, right margin at max width, so the same margins etc. as the regular text) I get a different line break. 

My question is: is this intentional or is there something I can do on my side to prevent the different behavior?

I can't provide a plain TeX test file yet, just an output of my software at https://github.com/speedata/publisher/issues/125 

The first paragraph uses a parshape table.


Patrick