keep track of whe a qti matchingsublist came from (for later referencing the qt->* fields (weights etc.)

PosdbTable.cpp

@@ -5020,6 +5020,7 @@ void PosdbTable::delNonMatchingDocIdsFromSubLists() {
 					qti->m_matchingSublist[x].m_end	    = newEndPtr[k];
 					qti->m_matchingSublist[x].m_cursor	    = newStartPtr;
 					qti->m_matchingSublist[x].m_savedCursor = newStartPtr;
+					qti->m_matchingSublist[x].m_baseSubListIndex    = j;
 					qti->m_numMatchingSubLists++;
 					break;
 				}

PosdbTable.h

@@ -56,6 +56,7 @@ public:
 		const char *m_end;
 		const char *m_cursor;
 		const char *m_savedCursor;
+		int         m_baseSubListIndex;               //which of m_subList[] entries it is based on
 	} m_matchingSublist[MAX_SUBLISTS];
 	int32_t   m_numMatchingSubLists;