Hi,
i am writting a part of a widget that have to display a file and then highlight a line off this file.

The file is properly loaded and the wanted line highlighted but not visible : the QTextEdit widget does not scroll to the cursor position ...

the code is
Qt Code: 
  1. //... doing things before ...
  2. //show file
  3. QTextEdit * editor = new QTextEdit(current_body_widget);
  4. editor->setFocus();
  5. {
  6.   QString file_to_view = QDir::cleanPath(QString("%1%2%3").arg(build_dir).arg(QDir::separator()).arg(fp.file));
  7.   QString error_str;
  8.   QFile file( file_to_view );
  9.   if ( !file.exists() ) {
  10.     error_str = QString( "%1 does not exist." ).arg( file_to_view );
  11.   }else{
  12.     if ( !file.open( QFile::ReadOnly | QFile::Text ) ) {
  13.       error_str = QString( "Cannot open %1" ).arg( file_to_view );
  14.     }
  15.   }
  16.   if(error_str.isEmpty()){
  17.     int nb_char=0;
  18.     int pos = 0;
  19.     int line = 0;
  20.     editor->setPlainText( QString("") );
  21.     QTextStream in(&file);
  22.  
  23.     while(!in.atEnd()){
  24.       line++;
  25.       if(line == pi.line)
  26.         pos = nb_char;
  27.       QString line = in.readLine();
  28.       editor->append(line);
  29.       nb_char+= line.size() + 1;  //+1 : '\n'
  30.     }
  31.  
  32.     //moving cursor
  33.     QTextCursor text_cursor = editor->textCursor();
  34.     text_cursor.setPosition(pos);
  35.  
  36.     text_cursor.select(QTextCursor::BlockUnderCursor);
  37.     editor->ensureCursorVisible();
  38.     editor->setTextCursor(text_cursor);
  39.   }
  40.   else
  41.     editor->setPlainText( error_str );
  42.   //editor->setReadOnly(true);
  43. }
  44.  
  45. editor->update();
  46. layout->addWidget(editor);
  47. //... doing things after ...
To copy to clipboard, switch view to plain text mode 

What am i doing wrong ?