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/PathVariableDialog.java
else if (operationMode == EXISTING_VARIABLE)
            this.standardMessage = IDEWorkbenchMessages.PathVariableDialog_message_existingVariable;
        else
            this.standardMessage = IDEWorkbenchMessages.PathVariableDialog_message_editLocation;
    }
    /**
     * Configures this dialog's shell, setting the shell's text.
     * 
     * @see org.eclipse.jface.window.Window#configureShell(Shell)
     */
    protected void configureShell(Shell shell) {
        super.configureShell(shell);
        if (operationMode == NEW_VARIABLE)
            shell.setText(IDEWorkbenchMessages.PathVariableDialog_shellTitle_newVariable);
        else if (operationMode == EXISTING_VARIABLE)
            shell.setText(IDEWorkbenchMessages.PathVariableDialog_shellTitle_existingVariable);
        else
            shell.setText(IDEWorkbenchMessages.PathVariableDialog_shellTitle_editLocation);
    }
    /**
     * Creates and returns the contents of this dialog (except for the button bar).
     * 
     * @see org.eclipse.jface.dialogs.TitleAreaDialog#createDialogArea
     */
    protected Control createDialogArea(Composite parent) {
        
        Composite parentComposite = (Composite) super.createDialogArea(parent);
        initializeDialogUnits(parentComposite);