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If a valid character in the editor Window is incompatible with source file encoding, an error should be raised when the file is saved. It would also be nice if such "invalid" characters were visually marked in the GUI (a dedicated color ?). See http://www.netbeans.org/servlets/ReadMsg? msgId=738966&listName=nbusers for a more detailed rationale. p.b.
Cf. FileEncodingQuery.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss