Provide stronger checking for region display. Fix x/y flip. #603

Job	Run time
initial_checks / Load tox environments	7s
initial_checks / codestyle (ubuntu-latest)	29s
tests / Load tox environments	5s
tests / py38-test-lts-all (ubuntu-latest)	1m 50s
tests / py39-test (ubuntu-latest)	1m 28s
tests / py310-test-all (ubuntu-latest)	1m 33s
tests / py311-test (ubuntu-latest)	1m 27s
tests / py311-test-all (ubuntu-latest)	1m 37s
tests / py38-docs (ubuntu-latest)	4m 1s
tests / py311-docs (macos-latest)	8m 17s
tests / py38-test-all (macos-latest)	3m 22s
tests / py39-test (macos-latest)	3m 6s
tests / py310-test-all (macos-latest)	2m 6s
tests / py311-test (macos-latest)	1m 53s
tests / py38-test (windows-latest)	3m 4s
tests / py310-test (windows-latest)	2m 42s
tests / py310-test-dev-all (ubuntu-latest)	1m 41s
tests / py311-test-dev (ubuntu-latest)	2m 9s
publish / Build source and wheel distribution	2m 46s
	43m 43s

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