QTextEdit html span order

I'm having a problem with inserting html into a QTextEdit.
Sometimes when I insert text with multiple spans, the order of the spans gets inverted.

Part of the code (on a QTextEdit object):

Code:

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qDebug()<<"html"<<html;
  block=true;
  setHtml(html);
  qDebug()<<"new text"<<toPlainText();

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The Output:

Code:

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html "<style type="text/css">.ok{color:darkgreen;} .fail{color:darkred;} .cmd{color:darkblue;}</style>test1 test2 <span class="ok">test</span>" 
new text "testtest1 test2 "

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Does Anyone have an idea how this can be solved?

The complete class:

Code:

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#include <QtGui/qmainwindow.h>
#include <QDebug>
#include <QtGui/qtextdocumentfragment.h>
 
#include "ScriptEditor2.h"
#include "ScriptInterpreter.h"
 
ScriptEditor2::ScriptEditor2()
{
  setAcceptRichText(false);
  connect(this,SIGNAL(textChanged()),this,SLOT(highlight()));
  block=false;
 
  QMainWindow* win=new QMainWindow();
  win->setCentralWidget(this);
  win->show();
}
 
void ScriptEditor2::highlight(){
  if(block) return;
 
  QTextCursor curs=textCursor();
  QString text=toPlainText();
  qDebug()<<"text"<<text;
  int first=curs.position();
  int last=first;
  while(last<text.size() && text[last]!='\n') last++;
  while(first>=0 && text[first]!='\n') first--;
  text.replace("\n","<br>");
  QString html("<style type=\"text/css\">.ok{color:darkgreen;} .fail{color:darkred;} .cmd{color:darkblue;}</style>");
 
  QList<QString> lines=text.split('\n');
  qDebug()<<"lines"<<lines;
 for(int i=0;i<lines.size();i++){
    if(i>0) html.append("<br>");
 
    QString cmd;
    QList<int> errors;
    QList<QString> words=lines[i].split(' ');
    qDebug()<<"words"<<words;
    for(int j=0;j<words.size();j++){
      if(j>0) html.append(' ');
 
      if(j==0){
        if(ScriptInterpreter::commands().contains(words[j])){
          html.append("<span class=\"cmd\">").append(words[j]).append("</span>");
          cmd=words[j];
        }else
          html.append(words[j]);
      }else if(j==1){
        if(ScriptInterpreter::args(cmd).contains(words[j])){
          html.append("<span class=\"cmd\">").append(words[j]).append("</span>");
          errors=ScriptInterpreter::test(cmd,words[j],words.mid(2));
        }else
          html.append(words[j]);
      }else{
      if(errors.contains(j-2))
          html.append("<span class=\"fail\">").append(words[j]).append("</span>");
        else
          html.append("<span class=\"ok\">").append(words[j]).append("</span>");
      }
    }
  }
 
  qDebug()<<"html"<<html;
  block=true;
  setHtml(html);
  qDebug()<<"new text"<<toPlainText();
  block=false;
  setTextCursor(curs);
  qDebug()<<"-----------------------";
}

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