private int countIndentCharsAt(int line) {
      int count = 0;
      CharSequence docChars = myDocument.getCharsSequence();
      for (int offset = myDocument.getLineStartOffset(line); offset < myDocument.getTextLength(); offset ++) {
        char c = docChars.charAt(offset);
        if (c != ' ' && c != '\t') break;
        count ++;
      }
      return count;
    }
private int countIndentCharsAt(int line)