Janitor: fix memory leaks.

Fwk/AppFwk/cafUserInterface/cafPdmUiTreeEditorHandle.h

@@ -54,7 +54,11 @@ class PdmUiTreeEditorHandle : public PdmUiEditorHandle
 {
 public:
     PdmUiTreeEditorHandle() {}
-    ~PdmUiTreeEditorHandle() override {}
+    ~PdmUiTreeEditorHandle() override
+    {
+        delete m_widget.data();
+        m_widget.clear();
+    }
 
     QWidget* getOrCreateWidget( QWidget* parent );
     QWidget* widget() { return m_widget; }

Fwk/AppFwk/cafUserInterface/cafPdmUiTreeViewEditor.h

@@ -87,8 +87,10 @@ public:
     explicit PdmUiTreeViewWidget( QWidget* parent = nullptr )
         : QTreeView( parent )
     {
-        setStyle( new PdmUiTreeViewStyle );
+        m_style = std::make_shared<PdmUiTreeViewStyle>();
+        setStyle( m_style.get() );
     };
+
     ~PdmUiTreeViewWidget() override{};
 
     bool isTreeItemEditWidgetActive() const { return state() == QAbstractItemView::EditingState; }
@@ -96,6 +98,8 @@ public:
 protected:
     void dragMoveEvent( QDragMoveEvent* event ) override;
     void dragLeaveEvent( QDragLeaveEvent* event ) override;
+
+    std::shared_ptr<PdmUiTreeViewStyle> m_style;
 };
 
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