strange behaviour of utf-8 files

[Stoik <staszek.goldstein@gmail.com>]

I am using gps 5.2.1 with utf-8 encoding in the editor. I tried to write a simple routine to strip the diacritical marks from Polish texts. When executing a test program, I got the "translation_error" message, and it turned out that the string consisting of Polish letters was treated as double the proper length. You can try for yourself: with
s: string := "ó";
we get s'length=2. Where is the hook? Is it a compiler error, gps error, or my own one?
Stoik