change type for XID (gh #92) #74

Job	Run time
ubuntu-20.04 + kwin	2m 28s
Test with perl:5.8.9-threaded-stretch	1m 40s
ubuntu-22.04 + fvwm	1m 49s
Test with perl:5.10.1-buster	1m 41s
ubuntu-22.04 + twm	1m 16s
Test with perl:5.12.5-stretch	1m 36s
Test with perl:5.14.4-stretch	1m 19s
Test with perl:5.16.3-buster	1m 40s
Test with perl:5.18.4-buster	1m 26s
Test with perl:5.22.4-stretch	1m 39s
Test with perl:5.36.0-bullseye	3m 20s
Test with perl:5.38.0-bookworm	1m 34s
	21m 28s

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