Wrong widget receives TouchUpdate event on MacOS

On MacOS QTouchEvents from `TouchPad` behave inconsistently compared to `TouchScreen` events. If we have a window which accepts touch events and it has a child widget (it doesn't matter if it accepts touch events). Then when doing the propagation, the parent window successfully receives the `TouchBegin`, which it accepts, but the subsequent `TouchUpdate/End` are not received by the window, but by the child widget. This is possibly due to: https://github.com/qt/qtbase/blob/dev/src/widgets/kernel/qapplication.cpp#L3843-L3846, disallowing the event propagation mechanism from setting the target in `activateImplicitTouchGrab`.

To reword the bug above, if we have two nested widgets and if it is the parent which calls an `accept()` on the event, despite that the event is still sent to child when using TouchPad on MacOS.

To rephrase the bug description above: if we have two nested widgets, and the parent widget calls `accept()` on the event, the update/end event is still sent to the child widget when using a TouchPad on MacOS.

I've attached a demo, if you hover the cursor over the push button and try doing a pinch gesture, the event filter isn't called in the parent. I've tried overriding the widget and calling `event->ignore()` – but to no avail (it may take a couple of tries, and Focus in and out for the bug to trigger).