QT: Fixed segfault when closing GE.

xtt/lib/cow/qt/cow_wow_qt.cqt

@@ -309,12 +309,6 @@ void CoWowQt::PopList(void* data)
   pop(ctx);
 }
 
-void CoWowQt::DeleteList(void* data)
-{
-  CoWowListWidgetQt* ctx = (CoWowListWidgetQt*)data;
-  ctx->close();
-}
-
 void CoWowWarrantQt::reject()
 {
   QDialog::reject();

xtt/lib/cow/qt/cow_wow_qt.h

@@ -196,7 +196,6 @@ public:
       void(action_cb)(void*, char*, int), void(cancel_cb)(void*), void* ctx,
       int show_apply_button = 0);
   void PopList(void* ctx);
-  void DeleteList(void* ctx);
   void CreateFileSelDia(const char* title, void* parent_ctx,
       void (*file_selected_cb)(void*, char*, wow_eFileSelType),
       wow_eFileSelType file_type, wow_eFileSelAction action);

xtt/lib/ge/qt/ge_qt.cqt

@@ -63,6 +63,7 @@
 #include "wb_wnav_selformat.h"
 
 #include <QApplication>
+#include <QCloseEvent>
 #include <QFontDatabase>
 #include <QHBoxLayout>
 #include <QInputDialog>
@@ -1237,7 +1238,7 @@ void GeQt::update()
 void GeQtWidget::closeEvent(QCloseEvent* event)
 {
   ge->Ge::activate_exit();
-  QWidget::closeEvent(event);
+  event->ignore();
 }
 
 void GeQtWidget::focusInEvent(QFocusEvent* event)
@@ -1266,11 +1267,11 @@ GeQt::~GeQt()
   }
 
   if (open_dialog) {
-    wow->DeleteList(open_dialog);
+    ((CoWowListWidgetQt*)open_dialog)->close();
   }
 
-  if (subgraphs_widget) {
-    subgraphs_widget->close();
+  if (subgraphs) {
+    delete subgraphs;
   }
   delete subpalette;
   delete recall_entry;
@@ -1288,7 +1289,7 @@ GeQt::~GeQt()
     delete objectnav;
   }
 
-  toplevel->close();
+  delete toplevel;
 
   if (exit_when_close) {
     exit(0);
@@ -1325,7 +1326,6 @@ GeQt::GeQt(void* x_parent_ctx, ldh_tSesContext x_ldhses, int x_exit_when_close,
 
   toplevel->setMinimumSize(window_width, window_height);
   toplevel->setWindowTitle(fl(title));
-  toplevel->setAttribute(Qt::WA_DeleteOnClose);
 
   CoWowQt::SetWindowIcon(toplevel);
 

xtt/lib/ge/qt/ge_subgraphs_qt.cqt

@@ -45,6 +45,7 @@
 #include "ge_attr_qt.h"
 #include "ge_subgraphs_qt.h"
 
+#include <QCloseEvent>
 #include <QMenuBar>
 #include <QTimer>
 #include <QVBoxLayout>
@@ -57,7 +58,7 @@ void SubGraphsQtWidget::closeEvent(QCloseEvent* event)
     trace_timerid->stop();
     delete subgraphs;
   }
-  QWidget::closeEvent(event);
+  event->ignore();
 }
 
 void SubGraphsQtWidget::focusInEvent(QFocusEvent* event)
@@ -119,7 +120,6 @@ SubGraphsQt::SubGraphsQt(void* xn_parent_ctx, const char* xn_name,
   toplevel = new SubGraphsQtWidget(this);
   toplevel->setMinimumSize(300, 500);
   toplevel->setWindowTitle(fl(name));
-  toplevel->setAttribute(Qt::WA_DeleteOnClose);
 
   // Menu
   QMenuBar* menu_bar = new QMenuBar(toplevel);
@@ -171,6 +171,8 @@ SubGraphsQt::~SubGraphsQt()
   }
 
   delete brow;
+
+  delete toplevel;
 }
 
 void SubGraphsQt::trace_start()