- **Patch**: countdown --> push
- **Comment**:
Patch counted down - please push.
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** [issues:#5217] random results for the merge-rests-engraver regression test**
**Status:** Started
**Created:** Fri Oct 20, 2017 07:28 AM UTC by Knut Petersen
**Last Updated:** Sat Nov 09, 2019 05:49 PM UTC
**Owner:** Jonas Hahnfeld
**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.
**Update Nov 5th 2019**
Issue 5217: Fix sorting order without outside-staff-priority
If the two Grobs have no outside-staff-priority, the compare function
staff_priority_less() would relate the two pointers. This may lead to
changing sorting orders in subsequent runs, apparently resulting in
"random" positions in the regression tests rest-dot-position.ly and
sometimes merge-rests-engraver.ly.
Solve this by keeping the original order in the vector:
* Mark two Grobs without outside-staff-priority as being equal by
always returning false (none is less than the other), and
* use vector_stable_sort() to keep equal items in their relation.
http://codereview.appspot.com/554960043
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