@Override
	public void dispose() {
		super.dispose();
		if (passwordField != null) {
			passwordField.setText("");
			workPanel.remove(passwordField);
			passwordField = null;
		}
	}
Simple dialog with single input field to prompt user for password.
<p>
User can cancel, or cancel-all, which can be determined by inspecting
the value of the semi-visible member variables.
<p>
Treat this as an internal detail of PopupGUIPasswordProvider.
Ghidra/Features/Base/src/main/java/ghidra/formats/gfilesystem/crypto/PasswordDialog.java