QTextEdit undo issue

There is an issue in undo – redo for QTextEdit control. We can duplicate this issue with the help of following steps.

1. Enter some text in QTextEdit.
2. Select the text by Ctrl+A
3. Override the text as "test"
3. Ctrl+Z to undo the changes
>> "t" character remained "est" undone

Sample Code:

#include <QApplication>
#include<QtGui>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *w = new QWidget();
    QTextEdit *textEdit = new QTextEdit(w);
    w->show();

    
    return a.exec();
}