private boolean lineContainsWhiteSpaceSymbolsOnly(int lineNumber) {
    int startOffset = myDocument.getLineStartOffset(lineNumber);
    int endOffset = myDocument.getLineEndOffset(lineNumber);
    return CharArrayUtil.isEmptyOrSpaces(myDocument.getCharsSequence(), startOffset, endOffset);
  }
private boolean lineContainsWhiteSpaceSymbolsOnly(int lineNumber)