BUG: avoid dl-close issue by cleaning resources ourselves

Modules/Wrappers/QtWidget/src/otbApplicationLauncherQt.cxx

@@ -103,5 +103,12 @@ int main(int argc, char* argv[])
   mainWindow->show();
 
   // Start event processing loop
-  return qtApp.exec();
+  int ret = qtApp.exec();
+
+  // Clean resources
+  if (mainWindow) delete mainWindow;
+  app = ITK_NULLPTR;
+  ApplicationRegistry::CleanRegistry();
+
+  return ret;
 }

Modules/Wrappers/QtWidget/test/otbWrapperQtWidgetShowWidget.cxx

@@ -104,6 +104,8 @@ int otbWrapperQtWidgetShowWidget(int argc, char* argv[])
     // clean main window
     if (mainWindow) delete mainWindow;
     }
+
+  ApplicationRegistry::CleanRegistry();
   
   if (result)
     {