Bug 147727 UI incorrectly prevents overlapping project locations on disk
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/ide/dialogs/WizardNewProjectNameAndLocationPage.java
private static final int SIZING_TEXT_FIELD_WIDTH = 250;
    /**
     * Creates a new project creation wizard page.
     *
     * @param pageName the name of this page
     */
    public WizardNewProjectNameAndLocationPage(String pageName) {
        super(pageName);
        setPageComplete(false);
        initialLocationFieldValue = Platform.getLocation();
        customLocationFieldValue = ""; 
    }
    /* (non-Javadoc)
     * Method declared on IWizardPage
     */
    public boolean canFlipToNextPage() {
        
        return isPageComplete();
    }
    /* (non-Javadoc)
     * Method declared on IDialogPage.
     */
    public void createControl(Composite parent) {
        Composite composite = new Composite(parent, SWT.NULL);
        composite.setLayout(new GridLayout());
        composite.setLayoutData(new GridData(GridData.FILL_BOTH));
        composite.setFont(parent.getFont());
        PlatformUI.getWorkbench().getHelpSystem().setHelp(composite,
                IIDEHelpContextIds.NEW_PROJECT_WIZARD_PAGE);