Make an OutputGroup for preset inputs

In SelectCoins, for our preset inputs, we combine all of the preset
inputs into a single OutputGroup. This allows us to combine the preset
inputs with additional selection algo results.

Author: achow101

src/wallet/spend.cpp

@@ -443,6 +443,7 @@ bool SelectCoins(const CWallet& wallet, const std::vector<COutput>& vAvailableCo
     // calculate value from preset inputs and store them
     std::set<CInputCoin> setPresetCoins;
     CAmount nValueFromPresetInputs = 0;
+    OutputGroup preset_inputs(coin_selection_params);
 
     std::vector<COutPoint> vPresetInputs;
     coin_control.ListSelected(vPresetInputs);
@@ -480,6 +481,10 @@ bool SelectCoins(const CWallet& wallet, const std::vector<COutput>& vAvailableCo
             value_to_select -= coin.effective_value;
         }
         setPresetCoins.insert(coin);
+        /* Set depth, from_me, ancestors, and descendants to 0 or false as don't matter for preset inputs as no actual selection is being done.
+         * positive_only is set to false because we want to include all preset inputs, even if they are dust.
+         */
+        preset_inputs.Insert(coin, 0, false, 0, 0, false);
     }
 
     // remove preset inputs from vCoins so that Coin Selection doesn't pick them.