fix "send coins" via context menu in address book

- the send coins context menu entry was not working anymore, because
  a non current version of #2220 was merged onto current master
- also removes some unneeded spaces and adds a comment to
  WalletModel::getNumTransactions()

src/qt/bitcoingui.cpp

@@ -475,9 +475,9 @@ void BitcoinGUI::gotoReceiveCoinsPage()
     if (walletFrame) walletFrame->gotoReceiveCoinsPage();
 }
 
-void BitcoinGUI::gotoSendCoinsPage()
+void BitcoinGUI::gotoSendCoinsPage(QString addr)
 {
-    if (walletFrame) walletFrame->gotoSendCoinsPage();
+    if (walletFrame) walletFrame->gotoSendCoinsPage(addr);
 }
 
 void BitcoinGUI::gotoSignMessageTab(QString addr)

src/qt/bitcoingui.h

@@ -162,7 +162,7 @@ private slots:
     /** Switch to receive coins page */
     void gotoReceiveCoinsPage();
     /** Switch to send coins page */
-    void gotoSendCoinsPage();
+    void gotoSendCoinsPage(QString addr = "");
 
     /** Show Sign/Verify Message dialog and switch to sign message tab */
     void gotoSignMessageTab(QString addr = "");

src/qt/walletframe.cpp

@@ -88,9 +88,9 @@ void WalletFrame::gotoReceiveCoinsPage()
     walletStack->gotoReceiveCoinsPage();
 }
 
-void WalletFrame::gotoSendCoinsPage()
+void WalletFrame::gotoSendCoinsPage(QString addr)
 {
-    walletStack->gotoSendCoinsPage();
+    walletStack->gotoSendCoinsPage(addr);
 }
 
 void WalletFrame::gotoSignMessageTab(QString addr)

src/qt/walletframe.h

@@ -47,7 +47,7 @@ public slots:
     /** Switch to receive coins page */
     void gotoReceiveCoinsPage();
     /** Switch to send coins page */
-    void gotoSendCoinsPage();
+    void gotoSendCoinsPage(QString addr = "");
 
     /** Show Sign/Verify Message dialog and switch to sign message tab */
     void gotoSignMessageTab(QString addr = "");

src/qt/walletmodel.cpp

@@ -56,6 +56,8 @@ int WalletModel::getNumTransactions() const
     int numTransactions = 0;
     {
         LOCK(wallet->cs_wallet);
+        // the size of mapWallet contains the number of unique transaction IDs
+        // (e.g. payments to yourself generate 2 transactions, but both share the same transaction ID)
         numTransactions = wallet->mapWallet.size();
     }
     return numTransactions;

src/qt/walletstack.cpp

@@ -97,11 +97,11 @@ void WalletStack::gotoReceiveCoinsPage()
         i.value()->gotoReceiveCoinsPage();
 }
 
-void WalletStack::gotoSendCoinsPage()
+void WalletStack::gotoSendCoinsPage(QString addr)
 {
     QMap<QString, WalletView*>::const_iterator i;
     for (i = mapWalletViews.constBegin(); i != mapWalletViews.constEnd(); ++i)
-        i.value()->gotoSendCoinsPage();
+        i.value()->gotoSendCoinsPage(addr);
 }
 
 void WalletStack::gotoSignMessageTab(QString addr)

src/qt/walletstack.h

@@ -76,7 +76,7 @@ public slots:
     /** Switch to receive coins page */
     void gotoReceiveCoinsPage();
     /** Switch to send coins page */
-    void gotoSendCoinsPage();
+    void gotoSendCoinsPage(QString addr = "");
 
     /** Show Sign/Verify Message dialog and switch to sign message tab */
     void gotoSignMessageTab(QString addr = "");

src/qt/walletview.cpp

@@ -74,9 +74,11 @@ WalletView::WalletView(QWidget *parent, BitcoinGUI *_gui):
     // Double-clicking on a transaction on the transaction history page shows details
     connect(transactionView, SIGNAL(doubleClicked(QModelIndex)), transactionView, SLOT(showDetails()));
 
-    // Clicking on "Verify Message" in the address book sends you to the verify message tab
+    // Clicking on "Send Coins" in the address book sends you to the send coins tab
+    connect(addressBookPage, SIGNAL(sendCoins(QString)), this, SLOT(gotoSendCoinsPage(QString)));
+    // Clicking on "Verify Message" in the address book opens the verify message tab in the Sign/Verify Message dialog
     connect(addressBookPage, SIGNAL(verifyMessage(QString)), this, SLOT(gotoVerifyMessageTab(QString)));
-    // Clicking on "Sign Message" in the receive coins page sends you to the sign message tab
+    // Clicking on "Sign Message" in the receive coins page opens the sign message tab in the Sign/Verify Message dialog
     connect(receiveCoinsPage, SIGNAL(signMessage(QString)), this, SLOT(gotoSignMessageTab(QString)));
 
     gotoOverviewPage();
@@ -257,13 +259,16 @@ void WalletView::gotoReceiveCoinsPage()
     connect(exportAction, SIGNAL(triggered()), receiveCoinsPage, SLOT(exportClicked()));
 }
 
-void WalletView::gotoSendCoinsPage()
+void WalletView::gotoSendCoinsPage(QString addr)
 {
     sendCoinsAction->setChecked(true);
     setCurrentWidget(sendCoinsPage);
 
     exportAction->setEnabled(false);
     disconnect(exportAction, SIGNAL(triggered()), 0, 0);
+
+    if(!addr.isEmpty())
+        sendCoinsPage->setAddress(addr);
 }
 
 void WalletView::gotoSignMessageTab(QString addr)

src/qt/walletview.h

@@ -105,7 +105,7 @@ public slots:
     /** Switch to receive coins page */
     void gotoReceiveCoinsPage();
     /** Switch to send coins page */
-    void gotoSendCoinsPage();
+    void gotoSendCoinsPage(QString addr = "");
 
     /** Show Sign/Verify Message dialog and switch to sign message tab */
     void gotoSignMessageTab(QString addr = "");