[vera-rubin]

With s = "abcd", seeking to 2 while a chunk request is pending makes both next_boundary(s, 0) and prev_boundary(s, 0) return Ok(Some(2)). The documented forward search starts after the current position, so it should return 3, and the previous boundary is 1.

use unicode_segmentation::{GraphemeCursor, GraphemeIncomplete::NextChunk};
let s = "abcd";
let mut cursor = GraphemeCursor::new(0, s.len(), true);
assert_eq!(cursor.next_boundary(&s[..1], 0), Err(NextChunk));
cursor.set_cursor(2);
assert_eq!(cursor.next_boundary(s, 0), Ok(Some(3)));

We clear the pending movement and pre-context state when the cursor changes position and document the cancellation behavior. A regression test covers all three input requests in both segmentation modes, and the full test suite passes.

Checkout: e77d186

— ChipLab