[Interest] Pan Gesture in QAbstractScrollArea for Mac

[sivan nanthiran]

Hi all,

I am curious to know on why in the default viewport creation in
QAbstractScrollAreaPrivate::init, the pan gesture registration (i.e
viewport->grabGesture(Qt::PanGesture) is protected by #ifndef Q_OS_MACOS
but the same is NOT done when a viewport is set through the function
of QAbstractScrollArea::setViewport.

The effect of this is that, when I use any default viewport, I don't see a
pan happening when I press and hold one finger on my trackpad, and then
drag it. However, the same is not true if I have set the overwritten the
viewport using the function.

Thanks in advance.

Regards,
Sivan
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