JTextArea - invisible characters

Hi together,
how can I make invisible characters like "carriage return", "line feed" or "tab" in JTextArea visible?
Some text editors can enable a feature, like
tab will be displayed as ->
carriage return will be displayed as CR
line feed will be displayed as LF
A.

RSyntaxTextArea has a method that toggles visibility of whitespace (spaces and tabs) but not newlines. You can make newlines "visible" by the code suggested above, but note that it inserts a real character at the end of each line. That means that it's really only a good solution for read-only documents.
The following should work:
textArea.setWhitespaceVisible(true);
textArea.setText(textArea.getText().replaceAll("\n", "\u00b6\n"));Note that the code snippet above must be done after the call to textArea.setSyntaxEditingStyle("whatever").

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