Fix crash when exiting via window manager on some systems.

apps/opencs/model/world/idtree.cpp

@@ -54,8 +54,7 @@ QVariant CSMWorld::IdTree::data  (const QModelIndex & index, int role) const
 
 QVariant CSMWorld::IdTree::nestedHeaderData(int section, int subSection, Qt::Orientation orientation, int role) const
 {
-    // FIXME: workaround only, a proper fix should stop QHideEvent calls after destruction
-    if (section < 0 || !idCollection() || section >= idCollection()->getColumns())
+    if (section < 0 || section >= idCollection()->getColumns())
         return QVariant();
 
     const NestableColumn *parentColumn = mNestedCollection->getNestableColumn(section);

apps/opencs/model/world/idtree.hpp

@@ -61,7 +61,6 @@ namespace CSMWorld
 
             virtual QModelIndex parent (const QModelIndex& index) const;
 
-            // TODO: check if below methods are really needed
             QVariant nestedHeaderData(int section, int subSection, Qt::Orientation orientation, int role = Qt::DisplayRole) const;
 
             NestedTableWrapperBase* nestedTable(const QModelIndex &index) const;

apps/opencs/view/doc/view.cpp

@@ -32,6 +32,10 @@ void CSVDoc::View::closeEvent (QCloseEvent *event)
         event->ignore();
     else
     {
+        // delete the subviews first
+        for (QList<CSVDoc::SubView *>::iterator iter = mSubViews.begin(); iter != mSubViews.end(); ++iter)
+            delete *iter;
+
         // closeRequest() returns true if last document
         mViewManager.removeDocAndView(mDocument);
     }