qt, test: Recognize dialog object by name

Author: hebasto

src/qt/sendcoinsdialog.cpp

@@ -406,6 +406,7 @@ void SendCoinsDialog::presentPSBT(PartiallySignedTransaction& psbtx)
     msgBox.setInformativeText(tr("The PSBT has been copied to the clipboard. You can also save it."));
     msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard);
     msgBox.setDefaultButton(QMessageBox::Discard);
+    msgBox.setObjectName("psbt_copied_message");
     switch (msgBox.exec()) {
     case QMessageBox::Save: {
         QString selectedFilter;

src/qt/test/wallettests.cpp

@@ -418,7 +418,7 @@ void TestGUIWatchOnly(interfaces::Node& node, TestChain100Setup& test)
     timer.setInterval(500);
     QObject::connect(&timer, &QTimer::timeout, [&](){
         for (QWidget* widget : QApplication::topLevelWidgets()) {
-            if (widget->inherits("QMessageBox")) {
+            if (widget->inherits("QMessageBox") && widget->objectName().compare("psbt_copied_message") == 0) {
                 QMessageBox* dialog = qobject_cast<QMessageBox*>(widget);
                 QAbstractButton* button = dialog->button(QMessageBox::Discard);
                 button->setEnabled(true);