Nothing
library(testit)
no_nav = "'controls': ['first', 'previous', 'play', 'next', 'last', 'loop', 'speed']"
assert(
'remove_navigator() removes the navigator from the navigation panel setting',
no_nav == remove_navigator("'controls': ['first', 'previous', 'play', 'next', 'last', 'navigator', 'loop', 'speed']"),
no_nav == remove_navigator(''),
(function(x) remove_navigator(x) == x)("'controls': ['first', 'last']")
)
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