[Lilypond-auto] [LilyIssues-auto] [testlilyissues:issues] Re: #5217 random results for the merge-rests-engraver regression test

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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.

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[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 (23.8 kB; image/png)
• 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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