There are test cases for the merge-riser coalescing logic that was added on 2020-06-08.

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The list above was generated by the following script:

.mode list
SELECT printf('  *  [%s](/info/%s?diff=0)', hash, hash) FROM (
  SELECT count(*) AS cnt, sum(cherrypick=1) AS cp, sum(cherrypick=0) AS n, 
      (SELECT substr(uuid,1,15) FROM blob WHERE rid=cid) AS hash
    FROM (
      SELECT cid, 0 AS cherrypick FROM plink WHERE NOT isprim
      UNION ALL
      SELECT childid, 1 FROM cherrypick
    )
   GROUP BY cid
   HAVING (cp>0 AND n>0) OR cp>3 OR n>2
   ORDER BY cnt
);

Similar links to the SQLite repository:

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Generated by a very similar script:

SELECT printf('  *  [%s](https://sqlite.org/src/info/%s?diff=0)', hash, hash) FROM (
  SELECT count(*) AS cnt, sum(cherrypick=1) AS cp, sum(cherrypick=0) AS n, 
      (SELECT substr(uuid,1,15) FROM blob WHERE rid=cid) AS hash
    FROM (
      SELECT cid, 0 AS cherrypick FROM plink WHERE NOT isprim
      UNION ALL
      SELECT childid, 1 FROM cherrypick
    )
   GROUP BY cid
   HAVING (cp>0 AND n>0) OR cp>2 OR n>2
   ORDER BY cnt
);