QToolButton and InstantPopup mode icon issue (large black down arrow across entire icon face)

[JohnGa]

Hello,
I have a toolbar, to which I add a QToolButton to show a menu. Prior to Qt 6.2.3, this used to display the tiny arrow menu indicator in the bottom right corner of the button. I think Qt 6.2.3 either introduced a bug or some setting that needs to be specified. Now, there is a large down arrow being displayed like this on top of the whole icon. Both DelayedPopup and InstantPopup show this problem :

But MenuButtonPopup seems to work correctly:
.

This is a code snippet to recreate the problem:

  QToolButton* button = new QToolButton();
  button->setPopupMode(QToolButton::InstantPopup);
  QMenu* menu = new QMenu();

  button->setMenu(menu);
  button->setIcon(QIcon(":/stop.png"));
  menu->addAction("test1");
  toolbar->addWidget(button);

I can't seem to fix with stylesheets or with any other settings. Is this a bug? Anybody have suggestions that can fix this problem?

Thanks

[Axel Spoerl]

Hi John,
indeed, this is a bug. See here for details and fixed Qt versions.
Brgds
Axel

[JohnGa]

Thanks @Axel-Spoerl.