Subtract fee from amount when sending privately.

Part of #82.

src/daemon/zcoind.ts

@@ -379,8 +379,9 @@ export class Zcoind {
         return data.txid;
     }
 
-    // Publicly send amount satoshi XZC to recipient. resolve()s with txid, or reject()s if we have insufficient funds
-    // or the call fails for some other reason.
+    // Publicly send amount satoshi XZC to recipient, subtracting the fee from the amount.
+    //
+    // resolve()s with txid, or reject()s if we have insufficient funds or the call fails for some other reason.
     async privateSend(auth: string, label: string, recipient: string, amount: number): Promise<string> {
         const data = await this.send(auth, 'create', 'sendPrivate', {
             outputs: [
@@ -389,7 +390,8 @@ export class Zcoind {
                     amount
                 }
             ],
-            label
+            label,
+            subtractFeeFromAmount: true
         });
 
         return data;

src/renderer/components/PaymentSidebars/Send.vue

@@ -93,6 +93,13 @@
                                     </div>
                                 </div>
 
+                                <div
+                                    v-if="privateOrPublic === 'private'"
+                                    class="fee-warning"
+                                >
+                                    Very slightly less will be sent because of fees.
+                                </div>
+
                                 <div class="amount-available">
                                     {{ convertToCoin(availableBalance) }} XZC available for {{ privateOrPublic }} send.
                                     <div v-if="unavailableBalance > 0">
@@ -528,6 +535,11 @@ fieldset {
         color: $color--polo-dark;
     }
 
+    .fee-warning {
+        font-style: italic;
+        font-size: 0.85em;
+    }
+
     .amount-available {
         text-align: right;
         color: $color--polo-dark;