Running the Qt4 test case below results in the loss of the "alt" tag, whereas in the Qt3 version it doesn't happen.

Qt4 test case:
//----------------------
#include <QtGui>

class Test: public QMainWindow
{
public:
Test( QWidget * parent = 0 )
: QMainWindow( parent )

{ QTextEdit * edit = new QTextEdit( this ); setCentralWidget( edit ); QString html = "<img src='foo' alt='stuff:0:0'>"; edit->setHtml( html ); qDebug() << "Html in : " << html; qDebug() << "Html out: " << edit->toHtml(); }

};

int main( int argc, char * argv[] )
{
QApplication a( argc, argv );
Test t;
t.resize( 700, 800 );
t.show();
return a.exec();
}

Qt3 test case:
//----------------------
#include <qapplication.h>
#include <qmainwindow.h>
#include <qtextedit.h>

class Test: public QMainWindow
{
public:
Test( QWidget * parent = 0, const char * name = 0 )
: QMainWindow( parent, name )

{ QTextEdit * edit = new QTextEdit( this ); setCentralWidget( edit ); QString html = "<img src='foo' alt='stuff:0:0'>"; edit->setTextFormat(Qt::RichText); edit->setText( html ); qDebug("Html in : %s \n", html.latin1() ); qDebug("Html out: %s \n", edit->text().latin1()); }

};

int main( int argc, char * argv[] )
{
QApplication a( argc, argv );
Test t;
t.resize( 700, 800 );
t.show();
return a.exec();
}