QScrollArea::ensureWidgetVisible() does not work properly on Android

The problem is visible when the Android keyboard pops up.

I have a scroll area with multiple line edits (the size of the scroll area is close to the size of the screen, or even more).

When I try to edit the line edit in the lower part of the screen, it's covered by the keyboard, so I can't see what I'm typing.

I tried to implement the following code to check if the keyboard is visible, and scroll the QScrollArea to show the needed widget:

QScrollArea *scrollArea = ...;
// fill the QScrollArea with QLineEdit's

QInputMethod *inputMethod = qApp->inputMethod();
connect(inputMethod, &QInputMethod::visibleChanged, [this, inputMethod]()
{
    if (inputMethod->isVisible()) {
        QWidget *areaWidget = scrollArea->widget();
        QList<QWidget*> childWidgets = areaWidget->findChildren<QWidget*>();
        for (const auto widget : childWidgets) {
            if (widget->hasFocus()) {
                ui->scrollArea->ensureWidgetVisible(widget);
                break;
            }
        }
    }
});

However it does not work

The problem is that ensureWidgetVisible() considers the focused widget to be still visible, so does nothing.

I suspect that it's because QInputMethod::keyboardRectangle() returns QRectF(0,0 0x0). So the size of the visible area is calculated incorrectly.