I’ve accidentally encountered the ROOT Graphics “To-Do” list.
There’s a “Polish TLatex” entry, which contains misleading informations. [quote]… \c{a} \c{A} and \c{e} \c{E} generate bad polish characters …[/quote] That’s perfectly legitimate, It is EXPECTED and should NOT be changed.
The “\c” means “cedilla” / “cedille”, while these Polish characters (and some another ones in another languages) should use ANOTHER ACCENT, which is called “ogonek”.
See also, for example: Ogonek vs. Cedilla Accent
Please correct your “To-Do” list. 