When a line of text having lot of white spaces Or only tabs copied in clipboard after selection( right click copy) , It does not pastes all spaces of line or tab to MsWord, It strips the white spaces when pasted with word.

It was not not reproduced with Qt 3 QTextEdit.

To reproduce:
Run

int main( int argc, char * argv[] )
{
    QApplication app( argc, argv );
    QTextEdit edit;
    
    edit.show();
    return app.exec();
}

Type something like :

lots                      of                           spaces

Select this line copy and paste in Ms word.
You can see all these spaces are stripped.