optimize import rescanning

src/mainwindow.cpp

@@ -393,23 +393,30 @@ void MainWindow::importPrivKey() {
 
     pui.helpLbl->setText(QString() %
                         "Please paste your private keys (z-Addr or t-Addr) here, one per line.\n" %
-                        "The keys will be imported into your connected zcashd node");                        
+                        "The keys will be imported into your connected zcashd node");  
+
     if (d.exec() == QDialog::Accepted && !pui.privKeyTxt->toPlainText().trimmed().isEmpty()) {
         auto keys = pui.privKeyTxt->toPlainText().trimmed().split("\n");
+
+        auto fnFinished = [=] (auto) {
+            qDebug() << "finished";
+            ui->statusBar->showMessage("Key import rescan finished");
+        };
+
         for (int i=0; i < keys.length(); i++) {
             auto key = keys[i].trimmed();
             if (key.startsWith("S") ||
                 key.startsWith("secret")) { // Z key
-                rpc->importZPrivKey(key, [=] (auto) {} );
+                rpc->importZPrivKey(key, i == key.length() -1, fnFinished);
             } else {    // T Key
-                rpc->importTPrivKey(key, [=] (auto) {} );
+                rpc->importTPrivKey(key, i == key.length() -1, fnFinished);
             }
         }
-    }
 
-    QMessageBox::information(this, 
+        QMessageBox::information(this, 
-        "Imported", "The keys were imported. It may be a while to rescan the blockchain with the new keys.",
+            "Imported", "The keys were imported. It may take several minutes to rescan the blockchain with the new keys for your balance to be shown accurately.",
-        QMessageBox::Ok);
+            QMessageBox::Ok);
+    }
 }
 
 void MainWindow::setupBalancesTab() {

src/rpc.cpp

@@ -184,24 +184,24 @@ void RPC::getTPrivKey(QString addr, const std::function<void(json)>& cb) {
     doRPC(payload, cb);
 }
 
-void RPC::importZPrivKey(QString addr, const std::function<void(json)>& cb) {
+void RPC::importZPrivKey(QString addr, bool rescan, const std::function<void(json)>& cb) {
     json payload = {
         {"jsonrpc", "1.0"},
         {"id", "someid"},
         {"method", "z_importkey"},
-        {"params", { addr.toStdString() }},
+        {"params", { addr.toStdString(), (rescan? "yes" : "no") }},
     };
     
     doRPC(payload, cb);
 }
 
 
-void RPC::importTPrivKey(QString addr, const std::function<void(json)>& cb) {
+void RPC::importTPrivKey(QString addr, bool rescan, const std::function<void(json)>& cb) {
     json payload = {
         {"jsonrpc", "1.0"},
         {"id", "someid"},
         {"method", "importprivkey"},
-        {"params", { addr.toStdString() }},
+        {"params", { addr.toStdString(), (rescan? "yes" : "no") }},
     };
     
     doRPC(payload, cb);

src/rpc.h

@@ -53,8 +53,8 @@ public:
 
     void getZPrivKey(QString addr, const std::function<void(json)>& cb);
     void getTPrivKey(QString addr, const std::function<void(json)>& cb);
-    void importZPrivKey(QString addr, const std::function<void(json)>& cb);
+    void importZPrivKey(QString addr, bool rescan, const std::function<void(json)>& cb);
-    void importTPrivKey(QString addr, const std::function<void(json)>& cb);
+    void importTPrivKey(QString addr, bool rescan, const std::function<void(json)>& cb);
 
     Turnstile* getTurnstile() { return turnstile; }