bs--get-marked-string is a compiled Lisp function in `
(bs--get-marked-string START-BUFFER ALL-BUFFERS)
Return a string which describes whether current buffer is marked.
START-BUFFER is the buffer where we started buffer selection.
ALL-BUFFERS is the list of buffers appearing in Buffer Selection Menu.
The result string is one of `bs-string-current', `bs-string-current-marked',
`bs-string-marked', `bs-string-show-normally', `bs-string-show-never', or