Comment 3 for bug 1487366

Hmm it seems QtMir has hardcoded a touch point size of zero :P

        mir::events::add_touch(*ev, id, action, tooltype,
                               touchPoint.pos().x(), touchPoint.pos().y(),
                               touchPoint.pressure(),
                               touchPoint.rect().width(),
                               touchPoint.rect().height(),
                               0 /* size */);

Trivial mistake.