BUILD_RTI conditional fixes and Qt6 API updates

- cmake/FindRTI.cmake: Add INTERFACE placeholder targets when RTI not found
- cmake/FindRTI.cmake: Force BUILD_RTI=OFF when RTI not installed
- Lts/Common/LtsSession/CMakeLists.txt: Make LtsSessionDataDds conditional on BUILD_RTI
- Lts/Viewer/CMakeLists.txt: Make LtsDataView conditional on BUILD_RTI
- Lts/Plugins/*/CMakeLists.txt: 97 plugin files wrapped in BUILD_RTI conditionals
- cmake/NGLMacros.cmake: Fix NGL_ADD_BIG_RESOURCES macro (removed premature return())
- Multiple Qt6 API fixes: QLinkedList→std::list, QStringRef→QStringView, etc.
- BUILD_RTI_FIXES_SUMMARY.md: Comprehensive documentation of all fixes

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Common/LtsSession/lts_session_manager.cpp

@@ -1,5 +1,12 @@
-
-
+/**
+ * @RDE_HEADER@
+ * Manages all the Sessions
+ * $Id$
+ * $HeadURL$
+ * $Author$
+ *
+ * Created by Mike Wille, SLSE, 2016-05-15
+ */
 
 
 #include "lts_session_manager.h"
@@ -30,7 +37,7 @@ LtsSessionManager::LtsSessionManager()
 
 LtsSessionManager::~LtsSessionManager()
 {
-
+//  qCritical() << "~LtsSessionManager";
 
   for (auto i = m_sessionMap.begin(); i != m_sessionMap.end(); ++i)
   {
@@ -46,24 +53,24 @@ bool LtsSessionManager::init(const DdsConnectionParams &connParams,
                              LtsAppDescriptor::App appId,
                              const QString &workspaceId,
                              bool headless,
-                             bool hidden) 
+                             bool hidden) // TODO: what to return ?
 {
-  
+  // TODO: check if maps empty?
   m_dataPluginList = dataPluginList;
   m_guiPluginList = guiPluginList;
   m_appId = appId;
   m_headless = headless;
 
-  
-  
-  
-  
+  // shortcut: on first login etc. we go through ExerciseChooser to select an exercise
+  // but when we're already in the exercise and starting an app from within,
+  // we don't want to have the exercise chooser a second time -> directly go through app
+  // and show the base layout
 
-  
+  // ????? Der Kommentar stimmt leider nicht. Loest leider nicht das Problem.
 
   bool bHasBaseLayout = connParams.exerciseId > 0;
 
-  LtsSession *session = createSession(connParams, bHasBaseLayout, true, hidden); 
+  LtsSession *session = createSession(connParams, bHasBaseLayout, true, hidden); // start Admin Session (for login, etc.)
   session->setWorkspaceId(workspaceId);
   return session;
 }
@@ -73,11 +80,11 @@ QVector<LtsSession *> LtsSessionManager::sessions()
 {
   return m_sessionMap.values().toVector();
 
+//  QVector<LtsSession *> result;
+//  for (auto i = m_sessionMap.begin(); i != m_sessionMap.end(); ++i)
+//    result.append(i.value());
 
-
-
-
-
+//  return result;
 }
 
 
@@ -93,9 +100,9 @@ void LtsSessionManager::softQuit()
 
   m_sessionMap.clear();
 
-  emit hideAllOtherBLWs(nullptr); 
+  emit hideAllOtherBLWs(nullptr); // for tablet mode! shows another hidden session from some other app or maybe the same app, after the visible one was hidden
 
-  QMetaObject::invokeMethod(this, &LtsSessionManager::signalQuit, Qt::QueuedConnection); 
+  QMetaObject::invokeMethod(this, &LtsSessionManager::signalQuit, Qt::QueuedConnection); // wait until all Session's deleteLater is done
 }
 
 
@@ -108,7 +115,7 @@ LtsSession *LtsSessionManager::createSession(const DdsConnectionParams &connPara
 
   if (session != nullptr)
   {
-    WARNING_LOG() << "Tried to create a Session that already exists";
+    WARNING_LOG(m_logger) << "Tried to create a Session that already exists";
     return nullptr;
   }
 
@@ -116,8 +123,8 @@ LtsSession *LtsSessionManager::createSession(const DdsConnectionParams &connPara
 
   connect(session, &LtsSession::signalQuit,
           this, &LtsSessionManager::signalQuit);
-  
-  
+  // QueuedConnection since Qt5.9.1 seems to send the buttonRelease event again when entering an
+  // eventloop within this slot. Not yet clear why this happens
   connect(session, &LtsSession::signalClose,
           this, &LtsSessionManager::slotCloseSession, Qt::QueuedConnection);
   connect(session, &LtsSession::signalLogout,
@@ -140,13 +147,13 @@ LtsSession *LtsSessionManager::createSession(const DdsConnectionParams &connPara
         return;
     }
 
-    WARNING_LOG() << "Previously deleted Session " << session->partitionId() << "/"
+    WARNING_LOG(m_logger) << "Previously deleted Session " << session->partitionId() << "/"
                           << session->partitionType() << " is still alive!";
   });
 #endif
 
   if (hasBaseLayout)
-    session->setBaseLayoutVisible(); 
+    session->setBaseLayoutVisible(); // after payloads are done (if any), the base layout will be created
 
   if (payloads)
     session->setPayloadsEnabled();
@@ -159,7 +166,7 @@ LtsSession *LtsSessionManager::createSession(const DdsConnectionParams &connPara
   {
 
     dds::domain::DomainParticipant dp = globSession->ddsConnector()->getDomainParticipant();
-    if (!session->init(dp, connParams, m_dataPluginList, m_guiPluginList)) 
+    if (!session->init(dp, connParams, m_dataPluginList, m_guiPluginList)) // init not successful? return invalid ptr
     {
       session->deleteLater();
       return nullptr;
@@ -167,10 +174,13 @@ LtsSession *LtsSessionManager::createSession(const DdsConnectionParams &connPara
   }
   else
   {
-    
+    /*
+     * init SOLLTE asynchron ablaufen.
+     * init läuft aber synchron, da die Payloads der Plugins DIrectConnections benutzen.
+     * AUf QueuedCOnnections umbauen ist schwerer, da init mit einem SessionCount von 0 rechnet, da init blocking ist und es daher nicht zum aufruf m_sessionMap[...] = ...; kommt......
+     */
 
-
-    if (!session->init(connParams, m_dataPluginList, m_guiPluginList, hidden)) 
+    if (!session->init(connParams, m_dataPluginList, m_guiPluginList, hidden)) // init not successful? return invalid ptr
     {
       session->deleteLater();
       return nullptr;
@@ -210,7 +220,7 @@ void LtsSessionManager::slotCloseSession()
       session->aboutToClose();
       session->setInactive();
       session->deleteLater();
-      m_sessionMap.remove(key); 
+      m_sessionMap.remove(key); // when destruction takes a long time, a new session may have been added which invalidated the iterator
 
       found = true;
       break;
@@ -220,9 +230,9 @@ void LtsSessionManager::slotCloseSession()
   if (!found)
     FATAL_LOG(m_logger) << "LtsSessionManager: Cannot find Session in map!";
 
-  emit hideAllOtherBLWs(nullptr); 
+  emit hideAllOtherBLWs(nullptr); // for tablet mode! shows another hidden session from some other app or maybe the same app, after the visible one was hidden
 
-  if (m_sessionMap.isEmpty()) 
+  if (m_sessionMap.isEmpty()) // quit app if all sessions closed
     emit signalQuit();
 }
 
@@ -231,10 +241,10 @@ LtsSession *LtsSessionManager::getSession(IDL::PartitionType partitionType, int
 {
   auto it = m_sessionMap.find(SessionKey(partitionType, partitionId));
 
-  if (it != m_sessionMap.end()) 
+  if (it != m_sessionMap.end()) // session found? return it!
     return it.value();
 
-  return nullptr; 
+  return nullptr; // not found
 }
 
-} 
+} // namespace LtsSession