Fixes to support interval_selection_map_quakes example #829

Job	Run time
build-vegafusion-jupyter-packages	9m 40s
build-vegafusion-packages	1m 51s
build-vegafusion-python-embed-linux-64	10m 38s
build-vegafusion-python-embed-linux-arm64	11m 31s
build-vegafusion-python-embed-osx-64	25m 13s
build-vegafusion-python-embed-osx-arm64	24m 33s
build-vegafusion-python-embed-win-64	26m 3s
build-vegafusion-server-linux-64	12m 58s
build-vegafusion-server-linux-arm64	10m 14s
build-vegafusion-wasm	7m 18s
check-rust	7m 34s
test-rust (ubuntu-20.04)	24m 13s
test-rust (windows-2022)	45m 34s
build-vegafusion-server-osx-64	26m 11s
test-rust (macos-11)	51m 39s
build-vegafusion-server-osx-arm64	21m 54s
build-vegafusion-server-win-64	22m 30s
test-vegafusion-python-linux-64	7m 29s
test-vegafusion-jupyter-linux-64	24m 41s
test-vegafusion-python-osx-64	11m 57s
test-vegafusion-python-win-64	9m 1s
	6h 32m 42s

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