Instantly update the mining GUI when number of threads changes

src/mainwindow.cpp

@@ -1586,6 +1586,11 @@ void MainWindow::setupMiningTab() {
             DEBUG("changing number of threads to " << threads);
             rpc->setGenerate(threads, [=] (QJsonValue response){
                 DEBUG("setgenerate response=" << response);
+
+                // instantly update miningthreads GUI
+                auto miningthreads = ui->tabWidget->findChild<QLCDNumber *>("miningthreads");
+                miningthreads->display(QString::number(threads)); // miningthreads
+                DEBUG("updated mining thread count to " << QString(threads) );
             });
         });
 
@@ -1604,8 +1609,10 @@ void MainWindow::setupMiningTab() {
                 DEBUG("setgenerate response=" << response);
                 // these values will auto-update in a few seconds but do it
                 // immediately so as to not confuse the user
-                // TODO: coredumps
-                // lcd5->display(QString(threads)); // miningthreads
+                auto miningthreads = ui->tabWidget->findChild<QLCDNumber *>("miningthreads");
+                // miningthreads->display(QString(threads)); // miningthreads
+                miningthreads->display(QString::number(threads)); // miningthreads
+                DEBUG("updated mining thread count to " << QString(threads) );
             });
         });