Two simultaneously opened onscreen keyboards could work incorrectly

Two simultaneously opened onscreen keyboards could work incorrectly

Condition: 
Two instances of QWaylandSeat, two opened onscreen keyboard on device with two screens.

Problem scenario:
When invoking:

void QWaylandQuickItem::takeFocus(QWaylandSeat *device)

correct QWaylandSeat (NOT a defaultSeat) passed, but also invoked:

void QQuickItem::forceActiveFocus(Qt::FocusReason reason)

which could finally emit 'activeFocusChanged', and, since in commit for QTBUG-108645 we have code:

connect(this, &QQuickItem::activeFocusChanged, this, &QWaylandQuickItem::updateFocus);

eventually 'updateFocus' ivoked, as an result 'setKeyboardFocus' called for wrong QWaylandSeat (defaultSeat)

As a result on one of onscreen keyboards some of keys not working