These functions get and set 'cursorjumper' barrier strings which will be used
jump() for a decision making whether to perform a jump.
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A character vector for barrier strings (there should
be no empty strings) or
Note that symbols in
barrier_strings shouldn't be explicitly
escaped, i.e. they should be in the form present in RStudio.
set_barrier_strings() returns call to
options() after setting
get_barrier_strings() returns currently set barrier
strings (if nothing was set explicitly, it returns default barrier strings).
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