src/java.base/share/classes/java/lang/StringBuffer.java

rev 54291 : 8221430: StringBuffer(CharSequence) constructor truncates when -XX:-CompactStrings specified
Reviewed-by: igerasim, rriggs
Contributed-by: Andrew Leonard <andrew_m_leonard@uk.ibm.com>

@@ -160,11 +160,11 @@
      *
      * @param      seq   the sequence to copy.
      * @since 1.5
      */
     public StringBuffer(CharSequence seq) {
-        super(String.LATIN1, seq.length(), 16);
+        super(getCharSequenceCoderHint(seq), seq.length(), 16);
         append(seq);
     }
 
     /**
      * Compares two {@code StringBuffer} instances lexicographically. This method