Support regions in imageviewer #564

Job	Run time
initial_checks / Load tox environments	7s
initial_checks / codestyle (ubuntu-latest)	35s
tests / Load tox environments	4s
tests / py38-test-lts-all (ubuntu-latest)	1m 43s
tests / py39-test (ubuntu-latest)	2m 0s
tests / py310-test-all (ubuntu-latest)	2m 26s
tests / py311-test (ubuntu-latest)	1m 24s
tests / py311-test-all (ubuntu-latest)	1m 44s
tests / py38-docs (ubuntu-latest)	5m 54s
tests / py311-docs (macos-latest)	5m 36s
tests / py38-test-all (macos-latest)	2m 17s
tests / py39-test (macos-latest)	2m 25s
tests / py310-test-all (macos-latest)	2m 39s
tests / py311-test (macos-latest)	2m 52s
tests / py38-test (windows-latest)	3m 45s
tests / py310-test (windows-latest)	3m 17s
tests / py310-test-dev-all (ubuntu-latest)	2m 43s
tests / py311-test-dev (ubuntu-latest)	2m 14s
publish / Build source and wheel distribution	4m 22s
	48m 7s

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