Changing submit policy of QDataWidgetMapper to AutoSubmit because if multiple changes are made at once not all of them are applied.

views/itemdetailmapper.cpp

@@ -15,7 +15,14 @@ ItemDetailMapper::ItemDetailMapper(QWidget* parent)
     : QWidget{parent} {
   /// model mapping
   m_mapper = std::make_unique<QDataWidgetMapper>(this);
-  m_mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
+  /// BUG: If multiple columns are changed not all changes are applied.
+  ///     Multiple changes are set individually by calling setData().
+  ///     Probably due to a conflicting dataChanged signal for too many roles&columns the data of
+  ///     the remaining columns is reset before setData is called.
+  ///     And a manual submit would also create multiple undo steps anyway.
+  /// Workaround: ManualSubmit -> AutoSubmit
+  // m_mapper->setSubmitPolicy(QDataWidgetMapper::ManualSubmit);
+  m_mapper->setSubmitPolicy(QDataWidgetMapper::AutoSubmit);
 
   /// model mapping buttons
   m_nextButton     = new QPushButton(tr("Ne&xt"));