Function viewportDragBegin

src/OpenLoco/src/Input/MouseInput.cpp:1468–1475

#pragma mark - Viewport dragging

    static void viewportDragBegin(Window* w)
    {
        w->flags &= ~Ui::WindowFlags::scrollingToLocation;
        state(State::viewportRight);
        _dragWindowType = w->type;
        _dragWindowNumber = w->number;
        _ticksSinceDragStart = 0;
    }

#pragma mark - Scrollview dragging