SILE's output is non-deterministic (in at least one case)

[ctrlcctrlv]

Finally I found a somewhat short MWE that doesn't require any of my modules.

Consider:

(The text is a nonsensical pseudo-injoke devoid of context.)

nondet.sil

\begin{document}
\script[src=packages/rebox]
\script[src=packages/raiselower]
\script{
local inputfilter = SILE.require("packages/inputfilter").exports
-- not done elsewhere so it doesn't mess up arguments to other commands
local function dblquotes(input, content) 
    return input:gsub('%"', '”')
end -- "Handle double quotes"
SILE.registerCommand("texmode", function(options, content)
local output = [[\rebox[height=0,width=0,depth=0]{\lower[height=72pt]{{Tinatawag nilá akón͠g ``magandá'' dahil ang akin͠g }{\em{ĉapelo}}{ ay nasa taman͠g lugár.}}}
\rebox[height=0,width=0,depth=0]{\lower[height=72pt - 1.25em]{Sa totoó lang, pan͠g{}unahin͠g kagandahan͠g{-}ásal sa m͠ga titik magsuót n͠g \em{ĉapelaĵoj} ganitó.}}
\rebox[height=0,width=0,depth=0]{\lower[height=72pt - 2.50em]{An͠g m͠ga titik na hindi, sila'y hindi edukado lan͠g pô kasí.}}]]
local tree = SILE.inputs.TeXlike.docToTree('\\begin{document}'..output..'\\end{document}')
SILE.process(inputfilter.transformContent(tree, dblquotes))
end)
local newline = function(_, content)
  SILE.settings.temporarily(function()
    SILE.settings.set("typesetter.parseppattern", "\n")
    SILE.doTexlike(" \n\\skip[height=0em]")
  end)
end

SILE.registerCommand("newline", newline)
SILE.registerCommand("\\", newline)
}
\font[family=Gentium Plus]
ĥ:
\texmode
\end{document}

Sometimes the output is:

Other times:

Notice how the word ''ĉapelaĵoj" moves about. Nothing changes in the document between invocations.

I do not know how to debug this. Help would be appreciated.

[alerque]

Wow that's a weird one.

I am able to replicate this on v0.10.7.r47-gc1b1c2b. It comes up out of order at least 1/3 of the time, and I don't see any pattern as to when.

[alerque]

Here is a pared down MWE:

\begin{document}
\script[src=packages/rebox]
\begin{script}
  local inputfilter = require("packages/inputfilter").exports
  local noop = function (input, _) return input end
  SILE.registerCommand("nondet", function(_, content)
    SILE.process(inputfilter.transformContent(content, noop))
  end)
\end{script}
\nondet{\rebox{foo \em{bar} baz}}
\end{document}

[alerque]

This (whatever it is) seems to be the same as #532.