Fix Jupyter plugin resize behavior #1380

Job	Run time
initialize	4s
build_pyodide (ubuntu-20.04)	28m 33s
build_js (ubuntu-20.04, 3.9, 18.x)	19m 23s
lint_python (ubuntu-20.04, 3.9)	4m 39s
test_js (ubuntu-20.04, 3.9, 18.x)	11m 29s
build_python (ubuntu-20.04, 3.9, 2014, 18.x, false, false)	23m 42s
benchmark_js	0s
test_js_and_python (ubuntu-20.04, 3.9, 18.x)	6m 14s
benchmark_python	0s
test_python_sdist	0s
test_python (ubuntu-20.04, 3.9, 18.x, false, false)	6m 17s
publish	0s
	1h 40m 21s

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