Bug in QTextBlock::iterator::operator--(int)

in QTextBlock::iterator::operator-(int)

we define

 int formatIndex = p->fragmentMap().fragment( n )->format;

and then NEVER do enter the while loop after:

  while (n != b && p->fragmentMap().fragment( n )->format != formatIndex) {

Correct solution is to use equal operator == instead of not equal operator != in while condition.