added Hint to Toolbox interface documentation to point out that widgets

shall not be deleted by the plugin after they were added.

call cleanup before exit of plugins.
explicitly delete plugins after cleanup.

BasePlugin/ToolboxInterface.hh

@@ -96,6 +96,8 @@ class ToolboxInterface {
       /** \brief Add a toolbox widget to the gui with the given name
        *
        * This signal adds a toolbox widget to the toolbox area on the right.
+       * Hint: Ownership of the widget is expected to be transferred with this signal.
+       *       Do not delete the widget in your plugins destructor.
        *
        * @param _name   Visible name of the toolbox
        * @param _widget Pointer to the toolbox widget
@@ -105,6 +107,8 @@ class ToolboxInterface {
       /** \brief Add a toolbox widget to the gui with the given name and an icon
        *
        * This signal adds a toolbox widget to the toolbox area on the right. And sets an icon for it
+       * Hint: Ownership of the widget is expected to be transferred with this signal.
+       *       Do not delete the widget in your plugins destructor.
        *
        * @param _name   Visible name of the toolbox
        * @param _widget Pointer to the toolbox widget
@@ -115,6 +119,8 @@ class ToolboxInterface {
       /** \brief Add a toolbox widget to the gui with the given name, icon and header area widget.
        *
        * This signal adds a toolbox widget to the toolbox area on the right. And sets an icon for it
+       * Hint: Ownership of the widget is expected to be transferred with this signal.
+       *       Do not delete the widget in your plugins destructor.
        *
        * @param _name   Visible name of the toolbox
        * @param _widget Pointer to the toolbox widget

Core/Core.cc

@@ -1159,6 +1159,10 @@ void Core::slotExit() {
   // Write all information on application exit
   writeOnExit();
   
+  // Call clearAll() before closing application
+  // in order to call all object's destructors...
+  clearAll();
+
   // Notify plugins of imminent exit.
   for ( uint i = 0 ; i < plugins_.size() ; ++i ){
       BaseInterface* basePlugin = qobject_cast< BaseInterface * >(plugins_[i].plugin);
@@ -1168,9 +1172,9 @@ void Core::slotExit() {
           basePlugin->exit();
  }
 
-  // Call clearAll() before closing application
-  // in order to call all object's destructors...
-  clearAll();
+  // Delete Plugins to actually call their destructor
+  for(PluginInfo p : plugins_)
+    delete p.plugin;
   
   // close the log file to ensure everything is writeen correctly
   if (logFile_)