Bug 298835 Merge e4 Project Path Variable back into the 3.6 stream
The virtual folder and filters changes are already in 3.6, the project path variable changes in e4 still remains to be merged.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/PathVariablesGroup.java
private Table variableTable;
    private Button addButton;
    private Button editButton;
    private Button removeButton;
    
    private FontMetrics fontMetrics;
    
    private boolean multiSelect;
    
    private int variableType;
    
    private Listener selectionListener;
    
    private SortedMap tempPathVariables;
    
    private Set removedVariableNames;
    
    private IPathVariableManager pathVariableManager;
    
    private final Image FILE_IMG = PlatformUI.getWorkbench().getSharedImages()
            .getImage(ISharedImages.IMG_OBJ_FILE);
    
    private final Image FOLDER_IMG = PlatformUI.getWorkbench()
            .getSharedImages().getImage(ISharedImages.IMG_OBJ_FOLDER);
    private final Image BUILTIN_IMG = PlatformUI.getWorkbench()
            .getSharedImages().getImage(ISharedImages.IMG_OBJ_FOLDER);
    
    private Image imageUnkown;