Full:
    █
 1. ├─NULL %>% f() %>% g(1, 2) %>% h(3, ., 4)
 2. └─rlang:::h(3, ., 4)

Collapsed:
    █
 1. ├─[ NULL %>% f() %>% g(1, 2) %>% h(3, ., 4) ]
 2. └─rlang:::h(3, ., 4)

Branch:
 1. NULL %>% f() %>% g(1, 2) %>% h(3, ., 4)
 2. rlang:::h(3, ., 4)
