Strange characters appear after saving changes

Sometimes strange characters like ś appear at different random locations in the file after saving the changes.

[HelioGuilherme66]

The encoding of my robot files is text/x-diff; charset=us-ascii

This may be the reason of the issue. I would always use UTF-8, because it is known to have less problems, specially on *nix systems. I found this on Robot Framework User Guide:

Similarly as with the TSV test data, plain text files are always expected to use UTF-8 encoding. As a consequence also ASCII files are supported.

[HelioGuilherme66]

Closed because (use OR operator):

• is too old,
• newest version should have it fixed,
• not reproducible,
• not an issue,
• is a question,
• lacks logs, versions info, e.t.c.,
• there is no other reason that justifies being opened.