Add adjusted_amount field to split

The adjusted_amount field of a split will hold the stock split adjusted amount.  The adjusted amount is initially the same as the original amount.  When the account balances are recomputed and a stock-split split type is encountered, the ratio of the stock split will be applied to the preceding splits adjusted_amounts.  If there are no stock splits in the split's account, the adjusted amount remains the original amount.

libgnucash/engine/Split.cpp

@@ -128,6 +128,8 @@ gnc_split_init(Split* split)
     split->reconciled_balance  = gnc_numeric_zero();
     split->noclosing_balance   = gnc_numeric_zero();
 
+    split->adjusted_amount     = gnc_numeric_zero();
+
     split->gains = GAINS_STATUS_UNKNOWN;
     split->gains_split = nullptr;
 }
@@ -520,6 +522,8 @@ xaccSplitReinit(Split * split)
     split->reconciled_balance  = gnc_numeric_zero();
     split->noclosing_balance   = gnc_numeric_zero();
 
+    split->adjusted_amount     = gnc_numeric_zero();
+
     qof_instance_set_idata(split, 0);
 
     split->gains = GAINS_STATUS_UNKNOWN;
@@ -604,6 +608,7 @@ xaccSplitCloneNoKvp (const Split *s)
     split->cleared_balance     = s->cleared_balance;
     split->reconciled_balance  = s->reconciled_balance;
     split->noclosing_balance   = s->noclosing_balance;
+    split->adjusted_amount     = s->adjusted_amount;
 
     split->gains = GAINS_STATUS_UNKNOWN;
     split->gains_split = nullptr;
@@ -689,6 +694,7 @@ xaccSplitDump (const Split *split, const char *tag)
     printf("    RBalance: %s\n",
            gnc_numeric_to_string(split->reconciled_balance));
     printf("    NoClose:  %s\n", gnc_numeric_to_string(split->noclosing_balance));
+    printf("    AdjAmt:   %s\n", gnc_numeric_to_string(split->adjusted_amount));
     printf("    idata:    %x\n", qof_instance_get_idata(split));
 }
 #endif
@@ -749,6 +755,8 @@ xaccFreeSplit (Split *split)
     split->acc         = nullptr;
     split->orig_acc    = nullptr;
 
+    split->adjusted_amount    = gnc_numeric_zero();
+
     split->date_reconciled = 0;
     G_OBJECT_CLASS (QOF_INSTANCE_GET_CLASS (&split->inst))->dispose(G_OBJECT (split));
 
@@ -915,6 +923,9 @@ xaccSplitEqual(const Split *sa, const Split *sb,
         if (!xaccSplitEqualCheckBal ("noclosing ", sa->noclosing_balance,
                                      sb->noclosing_balance))
             return FALSE;
+        if (!xaccSplitEqualCheckBal ("adjusted ", sa->adjusted_amount,
+                                     sb->adjusted_amount))
+            return FALSE;
     }
 
     if (!xaccTransEqual(sa->parent, sb->parent, check_guids, check_txn_splits,
@@ -1238,6 +1249,7 @@ xaccSplitSetAmount (Split *s, gnc_numeric amt)
     }
     else
         s->amount = amt;
+    s->adjusted_amount = s->amount;
 
     SET_GAINS_ADIRTY(s);
     mark_split (s);
@@ -1316,6 +1328,21 @@ xaccSplitGetReconciledBalance (const Split *s)
     return s ? s->reconciled_balance : gnc_numeric_zero();
 }
 
+gnc_numeric
+xaccSplitGetAdjustedAmount (const Split *s)
+{
+    return s ? s->adjusted_amount : gnc_numeric_zero();
+}
+
+void
+xaccSplitSetAdjustedAmount (Split *s, gnc_numeric amt)
+{
+    if  (!s) return;
+    if (gnc_numeric_check (amt)) return;
+
+    s->adjusted_amount = amt;
+}
+
 void
 xaccSplitSetBaseValue (Split *s, gnc_numeric value,
                        const gnc_commodity * base_currency)

libgnucash/engine/Split.h

@@ -345,6 +345,16 @@ gnc_numeric xaccSplitGetClearedBalance (const Split *split);
  */
 gnc_numeric xaccSplitGetReconciledBalance (const Split *split);
 
+/** Returns the stock-split adjusted amount of the split in the account's commodity.
+ */
+gnc_numeric xaccSplitGetAdjustedAmount (const Split *split);
+
+/** Sets the stock split adjusted amount of a split.  Note: The adjusted amount
+ *  will be reset when the account is rebalanced.
+ */
+void xaccSplitSetAdjustedAmount (Split *split, gnc_numeric amount);
+
+
 /** @} */
 
 /** @name Split utility functions

libgnucash/engine/SplitP.hpp

@@ -128,6 +128,9 @@ struct split_s
     gnc_numeric  noclosing_balance;
     gnc_numeric  cleared_balance;
     gnc_numeric  reconciled_balance;
+
+    /* The stock-split adjusted amount */
+    gnc_numeric  adjusted_amount;
 };
 
 struct _SplitClass