Get position(s) related to the selection(s).
Usage
rs_get_position_selection_start(
selection = c("all", "first", "last"),
context = rs_get_context()
)
rs_get_position_selection_end(
selection = c("all", "first", "last"),
context = rs_get_context()
)
rs_get_index_selection_start(
selection = c("first", "last"),
context = rs_get_context()
)
rs_get_index_selection_end(
selection = c("last", "first"),
context = rs_get_context()
)