Bug 55604 [implementation] JavaOutlinePage should dispose CustomFiltersActionGroup
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/javaeditor/JavaOutlinePage.java
}
	public void dispose() {
		
		if (fEditor == null)
			return;
			
		if (fMemberFilterActionGroup != null) {
			fMemberFilterActionGroup.dispose();
			fMemberFilterActionGroup= null;
		}
			
			
		fEditor.outlinePageClosed();
		fEditor= null;
		fSelectionChangedListeners.clear();
		fSelectionChangedListeners= null;
		
		fPostSelectionChangedListeners.clear();
		fPostSelectionChangedListeners= null;
		if (fPropertyChangeListener != null) {
			JavaPlugin.getDefault().getPreferenceStore().removePropertyChangeListener(fPropertyChangeListener);
			fPropertyChangeListener= null;
		}
		
		if (fMenu != null && !fMenu.isDisposed()) {
			fMenu.dispose();
			fMenu= null;
		}
		
		if (fActionGroups != null)