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The editor does not show characters that are not defined in the current font
character set but an open box (different from the question mark in a black
diamond used for invalid characters). Ask for a preview and, viola, the
character appears properly. It even copies and pastes correctly since all
displays are in Unicode.
Browsers are cleaver and in this situation realize that the character is unknown
the current character set but properly defined and displays it regardless. Even
the embed browser does this.
I’m sure that there is a file available that does the job. The editor just
needs to copy how browsers do this.