add calls to qApp->setWindowIcon(), to remove the need to set window icons for testnet with additional calls

src/qt/bitcoingui.cpp

@@ -71,6 +71,7 @@ BitcoinGUI::BitcoinGUI(QWidget *parent):
     resize(850, 550);
     setWindowTitle(tr("Bitcoin Wallet"));
 #ifndef Q_WS_MAC
+    qApp->setWindowIcon(QIcon(":icons/bitcoin"));
     setWindowIcon(QIcon(":icons/bitcoin"));
 #else
     setUnifiedTitleAndToolBarOnMac(true);
@@ -326,6 +327,7 @@ void BitcoinGUI::setClientModel(ClientModel *clientModel)
         {
             setWindowTitle(windowTitle() + QString(" ") + tr("[testnet]"));
 #ifndef Q_WS_MAC
+            qApp->setWindowIcon(QIcon(":icons/bitcoin_testnet"));
             setWindowIcon(QIcon(":icons/bitcoin_testnet"));
 #else
             MacDockIconHandler::instance()->setIcon(QIcon(":icons/bitcoin_testnet"));