Huh. It contains a call
+ vector_sort (dots, pure_position_less);
which uses a non-stable sort I guess. One could check whether using
vector_stable_sort makes any difference. Not that I have a clue what I am
doing here... The problem is that likely even with a stable sort, the order of
comparisons is not guaranteed, and the code looks like it triggers some
semi-recursive evaluation.
---
** [issues:#5217] random results for the merge-rests-engraver regression test**
**Status:** New
**Created:** Fri Oct 20, 2017 07:28 AM UTC by Knut Petersen
**Last Updated:** Tue Oct 31, 2017 11:33 PM UTC
**Owner:** Knut Petersen
**Attachments:**
-
[out-test-baseline-merge-rests-engraver.png](https://sourceforge.net/p/testlilyissues/issues/5217/attachment/out-test-baseline-merge-rests-engraver.png)
(23.8 kB; image/png)
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[out-test-merge-rests-engraver.png](https://sourceforge.net/p/testlilyissues/issues/5217/attachment/out-test-merge-rests-engraver.png)
(23.7 kB; image/png)
There is some randomness in the placement of dots. The merge-rests-engraver.ly
regtest (git-version557dc7) exposes the problem as the output might be one of
the two attached pngs. The probability for both results is identical on my
system.
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