b02d20dede590203b6ecca10be473e7e22179a51
braney
  Thu Jan 12 13:12:53 2023 -0800
deal with some weird edge cases in hub that Hiram's hub illicit.   Don't
read a single trackDb.txt file more than once even if it's referenced
from mulitple hubs.  Also, only the first time a genome is defined does
it get to populate its own groups.  Subsequent examples get put into
their own group, just like a normal track hub does.

diff --git src/hg/lib/hdb.c src/hg/lib/hdb.c
index 443c3ff..67240d6 100644
--- src/hg/lib/hdb.c
+++ src/hg/lib/hdb.c
@@ -875,31 +875,32 @@
 return (count >= 0 && count <= HDB_MAX_SEQS_FOR_SPLIT);
 }
 
 static void tableListHashAdd(struct hash *dbTblHash, char *profile, char *db)
 /* Add to a hash that maps a track/table name (unsplit) to an slName list
  * of actual table names (possibly split) -- we can compute this once and
  * cache it to save a lot of querying if we will check existence of
  * lots of tables. */
 {
 if (trackHubDatabase(db))
     {
     struct trackHub *hub = hubConnectGetHubForDb(db);
     if (hub != NULL)
         {
         struct trackHubGenome *hubGenome = trackHubFindGenome(hub, db);
-        struct trackDb *tdbList = trackHubTracksForGenome(hub, hubGenome, NULL), *tdb;
+        boolean foundFirstGenome = FALSE;
+        struct trackDb *tdbList = trackHubTracksForGenome(hub, hubGenome, NULL, &foundFirstGenome), *tdb;
         for (tdb = tdbList;  tdb != NULL;  tdb = tdb->next)
             {
             hashAdd(dbTblHash, tdb->table, slNameNew(tdb->table));
             }
         }
     return;
     }
 struct sqlConnection *conn = hAllocConnProfileMaybe(profile, db);
 if (conn == NULL)
     // Database does not exist, so no tables in the database exist -- leave the hash empty.
     return;
 struct slName *allTables =  sqlListTables(conn);
 
 if (!sameString(CUSTOM_TRASH,db) && !sameString("hgFixed",db) && hCanHaveSplitTables(db))
     {