fixes issue #17

src/gui/mainwindow.cpp

@@ -207,7 +207,7 @@ bool MainWindow::eventFilter(QObject* target, QEvent* event)
         if (event->type() == QEvent::KeyPress) {
             QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
             if (keyEvent->key() == Qt::Key::Key_Enter || keyEvent->key() == Qt::Key::Key_Return) {
-                if (keyEvent->modifiers() == Qt::ControlModifier) {
+                if (keyEvent->modifiers() & Qt::ControlModifier) {
                     checkSellerNo(true);
                 } else {
                     checkSellerNo(false);
@@ -220,7 +220,7 @@ bool MainWindow::eventFilter(QObject* target, QEvent* event)
         if (event->type() == QEvent::KeyPress) {
             QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
             if (keyEvent->key() == Qt::Key::Key_Enter || keyEvent->key() == Qt::Key::Key_Return) {
-                if (keyEvent->modifiers() == Qt::ControlModifier) {
+                if (keyEvent->modifiers() & Qt::ControlModifier) {
                     onPaidButtonTriggered();
                     return true;
                 }

src/gui/mainwindow.ui

@@ -112,7 +112,11 @@
             </widget>
            </item>
            <item>
-            <widget class="QDoubleSpinBox" name="givenSpinBox"/>
+            <widget class="QDoubleSpinBox" name="givenSpinBox">
+             <property name="maximum">
+              <double>999.990000000000009</double>
+             </property>
+            </widget>
            </item>
            <item>
             <widget class="QLabel" name="label_4">