Qt Creator incorrect warning message "Included header"

A new yellow warning presents itself that is wrong. "Included header dialog.h is not used directly (fix available) Source clangd. For example:

fu.h:

#include <QDialog>

class Dialog : public QDialog

{   Q_OBJECT public:     explicit Dialog(QWidget *parent = nullptr);     ~Dialog(); }

;

fu.cpp:

#include "dialog.h" /*\Included header dialog.h is not used directly (fix available)

Dialog::Dialog(QWidget *parent)
    : QDialog(parent)
{}

Dialog::~Dialog() {}

The "fix" is to delete the include statement. However, without the include statement, Dialog and QWidget are undefined. Therefore, the "fix" is incorrect.