Gui: Ensure that QuantitySpiBox handles expression properly

(cherry picked from commit febfd65e59)

src/Gui/QuantitySpinBox.cpp

@@ -453,6 +453,9 @@ void Gui::QuantitySpinBox::keyPressEvent(QKeyEvent* event)
     const auto isEnter = event->key() == Qt::Key_Enter || event->key() == Qt::Key_Return;
 
     if (d->normalize && isEnter && !isNormalized()) {
+        // ensure that input is up to date
+        handlePendingEmit();
+
         normalize();
         return;
     }