T37: review round 1: OSC 99 reads base64 group by group, so chunks split before encoding or after join, and the text, any UTF-8, is checked once whole; plain text alone refuses controls; a chunk that breaks a rule drops what its notification gathered; the tap keeps an OSC 99 body to its metadata and a full payload

src/term/tap/tests.rs

@@ -74,6 +74,13 @@ fn an_overlong_body_is_dropped() {
     assert_eq!(scan(&[&long, b"\x1b]7;b\x07"]), ["7;b"]);
 }
 
+#[test]
+fn an_osc_99_body_holds_its_metadata_and_a_full_payload() {
+    let osc = |length: usize| [&b"\x1b]99;"[..], &vec![b'a'; length - 3], b"\x07"].concat();
+    assert_eq!(scan(&[&osc(notify::BODY)]).concat().len(), notify::BODY);
+    assert!(scan(&[&osc(notify::BODY + 1)]).is_empty());
+}
+
 #[test]
 fn mouse_modes_follow_private_modes_in_order_across_reads() {
     use crate::term::mouse::{Format, Tracking};