Writes the current editor contents to the given stream. The return value is #t if there are no errors, #f otherwise. See also File Formats.
If the editor's style list has already been written to the stream, it is not re-written. Instead, the editor content indicates that the editor shares a previously-written style list. This sharing will be recreated when the stream is later read.
If start is 0 and end is 'eof negative, then the entire contents are written to the stream. If end is 'eof, then the contents are written from start until the end of the editor. Otherwise, the contents of the given range are written.