When QXcbConnection::xi2SetupDevices() reacts to a device hierarchy
event and re-discovers an already-known slave device, it doesn't call
xi2SetupSlavePointerDevice() again. I.e. it won't attempt to add it to
m_touchDevices or m_tabletData because it was already known. So it
should not clear m_touchDevices or m_tabletData either, but only remove
the touch devices that are known to have disappeared. Tablet styli
normally come and go from proximity, so it's ok to avoid deleting the
corresponding device data.
Also fix some other failure cases after testing hotplugging more with
tests/manual/inputdevices: there should be no crashes, no duplicated
devices after plugging (although the QAIM might have a bug that makes
it look that way), no leftover instances after unplugging.
Amends 2a9d93efc6
Pick-to: 6.6 6.5 6.5.2
Fixes: QTBUG-114334
Change-Id: I30f5e532f7dd3a465d56ecdd34d893cbadbf0453
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
a8a75d2c4b