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min-systems-per-page causes LilyPond to hang 2.20

From: Richard Shann
Subject: min-systems-per-page causes LilyPond to hang 2.20
Date: Wed, 21 Oct 2020 16:37:26 +0100

I've noticed that having

min-systems-per-page  = 2

can in some circumstances cause LilyPond to hang. The attached
non-minimal file exhibits this behavior:

Starting lilypond 2.20.0 []...
Processing `/tmp/frescobaldi-
Interpreting music...[8][16]
Preprocessing graphical objects...
Interpreting music...[8][16][24][32][40][48][56][64][72]
Preprocessing graphical objects...
Interpreting music...[8][16][24][32]
Preprocessing graphical objects...
Interpreting music...[8][16][24][32][40][48]
Preprocessing graphical objects...
Interpreting music...
Preprocessing graphical objects...
Calculating line breaks... 
Drawing systems... 
Fitting music on 5 pages...
[hangs ... manual abort]
Aborting lilypond 2.20.0 []...

commenting out the line
min-systems-per-page  = 2
allows it to typeset normally, curiously it does not have an orphan

I just wondered if this is a known issue - I don't see it mentioned in
the docs

there is a very large amount of irrelevant material in the attached
lily file which I would be in the best position to excise if that were
useful, but I wouldn't want to undertake the task if the issue was
already known about, or there was no-one wanting to work on it anyway,
or indeed if it wouldn't really help as this bug is not at all likely
to be due to some typo to be spotted by eye.
Let me know if help would be welcomed.

Richard Shann

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