On 3/9/2016 8:48 PM, Frank Mittelbach wrote:
I think I found a bug in tex.linebreak.
Consider the following code
function prelinebreak (head, groupnode) --- for pre_linebreak_filter
--- for example
local n,t
n, t = tex.linebreak(node.copy_list(head), {looseness = -1})
print("looseness=" .. t.looseness)
n, t = tex.linebreak(node.copy_list(head), {looseness = 0})
print("looseness=" .. t.looseness)
return true
end
and pass it in head a long enough hlist so that looseness -1 actually
works. The second line breaking with looseness=0 reports the previous
looseness ... same happens if you have looseness=+2 or +1 or so
it seems that tex.linebreak always reports the looseness of the previous
linebreak action in case you pass it a "0"
it helps if you also set some more (either explicit or at the tex
level), like:
looseness=1,
tolerance=4500,
pretolerance=100,
emergencystretch=655360
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