Busy indicator improvements (#4172) #2720

Job	Run time
R-CMD-check / setup	1m 35s
website / pkgdown	2m 27s
routine / routine	4m 31s
R-CMD-check / macOS-latest (4.4.2)	2m 45s
R-CMD-check / windows-latest (4.4.2)	4m 3s
R-CMD-check / ubuntu-latest (devel)	5m 12s
R-CMD-check / ubuntu-latest (4.4.2)	6m 35s
R-CMD-check / ubuntu-latest (4.3.3)	5m 11s
R-CMD-check / ubuntu-latest (4.2.3)	5m 40s
R-CMD-check / ubuntu-latest (4.1.3)	5m 22s
R-CMD-check / ubuntu-latest (4.0.5)	5m 55s
	49m 16s

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