Bad access when destroying QComboBox immediately after selecting item

1. Run the combobox_crash project
2. Click on the top combobox to open its popup
3. Move the mouse over the window's close button
4. Press the enter key to select the highlighted item and immediately click the close button
5. The app will crash just after the window closes

Repeating the same steps on the bottom combobox does not cause a crash. The second combobox has its style overridden with a proxy style that returns 0 for the SH_Menu_FlashTriggeredItem style hint, which is enabled in the default style on macOS.

QComboBox::hidePopup() uses a couple of timers if this style hint is set; if the widget is destroyed before the timers return then it will cause a crash.