[Wayland] If the mouse to change the focus widget while a popup widget is open, then mouse/keyboard interactions will break

The example below uses a QComboBox to trigger the problem, but the customer also reported similar outcomes with QMenu and QContextMenu.

Code

#include <QtWidgets>

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    QWidget win;
    win.resize(400, 300);
    win.show();

    auto cb = new QComboBox;
    cb->addItems({"Alpha", "Bravo", "Charlie"});

    auto layout = new QVBoxLayout(&win);
    layout->addWidget(new QLineEdit);
    layout->addWidget(cb);

    return app.exec();
}

Core steps to trigger the problem

Click on the QComboBox to open the popup, and select an item. Do this twice to trigger the warning, "qt.qpa.wayland: Wayland does not support QWindow::requestActivate()"

Detailed tests
Try these before and after triggering the warning:

1. Press the Tab key to move focus between the QLineEdit and QComboBox
2. While the QComboBox has focus, press the Up and Down keys to change QComboBox::currentItem
3. Click on each of the widgets

Expected Outcomes (before triggering the warning)

• (1) Each key press will move the "focus border" to the next widget
• (2) Each key press will change QComboBox::currentItem
• (3) Nothing interesting happens with each click

Actual Outcomes (After triggering the warning)

• (1) Nothing happens with each key press
• (2) Nothing happens with each key press
• (3) Each click triggers the warning, "qt.qpa.wayland: Wayland does not support QWindow::requestActivate()"

Notes

• Switching focus to a different window un-breaks things. Just repeat the steps above to break it again.
• Qt 5.15.17 LTS and 6.2.12 LTS are affected, but Qt 6.5.6 LTS and 6.7.2 are not