Qt6 migration fixes: RTI DDS alias targets, ErrorMessage namespace, DDS header include path

qt6-after/qt6-migrated-legatus/Lts/Tools/DdsView/rw/rwwidgets.cpp

@@ -9,13 +9,13 @@
   */
 
 #include "rwwidgets.h"
-#include <QStackedWidget>
-#include <QSpinBox>
+#include <QtWidgets/QStackedWidget>
+#include <QtWidgets/QSpinBox>
 #include <QVBoxLayout>
 #include <QCheckBox>
-#include <QDoubleSpinBox>
-#include <QLineEdit>
-#include <QComboBox>
+#include <QtWidgets/QDoubleSpinBox>
+#include <QtWidgets/QLineEdit>
+#include <QtWidgets/QComboBox>
 #include <LtsWidgets/lts_bitfield_widget.h>
 
 void MyLabel::mousePressEvent(QMouseEvent *ev)
@@ -66,7 +66,7 @@ RWWidget::RWWidget(QWidget *parent)
   , m_editableWidget(nullptr)
 {
   QVBoxLayout *l = new QVBoxLayout(this);
-  l->setMargin(0);
+  l->setContentsMargins(0, 0, 0, 0);
   l->setSpacing(0);
   l->addWidget(m_stackedWidget);
   m_stackedWidget->insertWidget(0, m_label);