ITS#8300 more for node_move fixups

When moving a node from the right neighbor, a different
adjustment is needed.

libraries/liblmdb/mdb.c

@@ -7612,7 +7612,6 @@ mdb_node_move(MDB_cursor *csrc, MDB_cursor *cdst)
 					m3->mc_ki[csrc->mc_top]++;
 				}
 			}
-		}
 
 			mp = csrc->mc_pg[csrc->mc_top];
 			for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
@@ -7627,6 +7626,26 @@ mdb_node_move(MDB_cursor *csrc, MDB_cursor *cdst)
 					m3->mc_ki[csrc->mc_top] = cdst->mc_ki[cdst->mc_top];
 				}
 			}
+		} else
+		/* Adding on the right, bump others down */
+		{
+			mp = csrc->mc_pg[csrc->mc_top];
+			for (m2 = csrc->mc_txn->mt_cursors[dbi]; m2; m2=m2->mc_next) {
+				if (csrc->mc_flags & C_SUB)
+					m3 = &m2->mc_xcursor->mx_cursor;
+				else
+					m3 = m2;
+				if (m3 == csrc) continue;
+				if (m3->mc_pg[csrc->mc_top] == mp) {
+					if (!m3->mc_ki[csrc->mc_top]) {
+						m3->mc_pg[csrc->mc_top] = cdst->mc_pg[cdst->mc_top];
+						m3->mc_ki[csrc->mc_top] = cdst->mc_ki[cdst->mc_top];
+					} else {
+						m3->mc_ki[csrc->mc_top]--;
+					}
+				}
+			}
+		}
 	}
 
 	/* Update the parent separators.