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/// compute a new selection index for the given list len,
/// taking into account whether we should cycle or not
pub fn move_sel(
selection: usize,
len: usize,
d: i32, // displacement
cycle: bool,
) -> usize {
if len == 0 {
return 0;
}
let ns = (selection as i32) + d;
if ns < 0 {
if cycle {
len - 1
} else {
0
}
} else if ns >= len as i32 {
if cycle {
0
} else {
len - 1
}
} else {
ns as usize
}
}
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