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I have a buggy system which reports a udev "change" event for an empty USB-C port every 0.14 seconds, which causes annoying frame hitches because SDL decides that means it needs to do a libusb hid_enumerate, which is slow (~25ms!) because of the get_usb_string() calls in there. We only need to re-enumerate if we've seen a device added or removed, so let's filter out the change event first. Signed-off-by: Steven Noonan <steven@valvesoftware.com> Signed-off-by: Sam Lantinga <slouken@libsdl.org>