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
/**
     * Creates the add/edit/remove buttons
     * 
     * @param parent the widget parent
     */
    private void createButtonGroup(Composite parent) {
        Font font = parent.getFont();
        Composite groupComponent = new Composite(parent, SWT.NULL);
        GridLayout groupLayout = new GridLayout();
        groupLayout.marginWidth = 0;
        groupLayout.marginHeight = 0;
        groupComponent.setLayout(groupLayout);
        GridData data = new GridData();
        data.verticalAlignment = GridData.FILL;
        data.horizontalAlignment = GridData.FILL;
        groupComponent.setLayoutData(data);
        groupComponent.setFont(font);
        addButton = new Button(groupComponent, SWT.PUSH);
        addButton.setText(IDEWorkbenchMessages.PathVariablesBlock_addVariableButton);
        addButton.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                addNewVariable();
            }
        });
        addButton.setFont(font);
        setButtonLayoutData(addButton);
        editButton = new Button(groupComponent, SWT.PUSH);
        editButton.setText(IDEWorkbenchMessages.PathVariablesBlock_editVariableButton);
        editButton.addSelectionListener(new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {