private void addEnvFilesExtension() {
    if (myEnvFilesExtension != null) return;
    myEnvFilesExtension = ExtendableTextComponent.Extension.create(AllIcons.General.OpenDisk, AllIcons.General.OpenDiskHover,
                                             ExecutionBundle.message("tooltip.browse.for.environment.files"), () -> browseForEnvFile());
    getTextField().addExtension(myEnvFilesExtension);
    getTextField().getEmptyText().setText(ExecutionBundle.message("status.text.environment.variables.or.env.files"));
  }
private void addEnvFilesExtension()