what systems support Xbutton1

[ravas]

Is Qt::XButton1 recognized on any OS other than Windows?
http://doc.qt.io/qt-5/qt.html#MouseButton-enum

[anda_skoa]

I am pretty sure the BackButton is recognized on other platforms as well.

A quick search through the Qt sources says it is being used in the QPAs for EGLFS, XCB, Wayland, DirectFB.
Would be surprised if it didn't also work on OS X and Windows.

Cheers,
_