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
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.ide.IDEWorkbenchMessages;
import org.eclipse.ui.internal.ide.IDEWorkbenchPlugin;
import org.eclipse.ui.plugin.AbstractUIPlugin;
/**
 * A widget group that displays path variables. 
 * Includes buttons to edit, remove existing variables and create new ones.
 * 
 * @since 2.1
 */
public class PathVariablesGroup {
    /**
     * Simple data structure that holds a path variable name/value pair.
     */
    public static class PathVariableElement {
        /**
         * The name of the element.
         */
        public String name;
        /**
         * The path of the element.
         */
        public IPath path;
    }
    
    private static final int SIZING_SELECTION_PANE_WIDTH = 400;
    
    private Shell shell;
    private Label variableLabel;