> Is there a specific reason for calling XISelectEvents() for each
slave vs using XIAllMasterDevices in QXcbConnection::xi2Select() in Qt?

Would have to dig into Qt code to tell that. But my guess is that
because it exposes QTouchDevice objects to applications. For every
QTouchEvent  you can get the QTouchDevice from where it came from. But
it might be that it could work with XIAllMasterDevices just as well.

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https://bugs.launchpad.net/bugs/1307701

Title:
  xserver mouse pointer emulation from touch breaks with QML app.

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