From 1f16c2e268e482ff2b555de0b97ee71745b6512f Mon Sep 17 00:00:00 2001
From: MarekSpodBiedry <73122968+MarekSpodBiedry@users.noreply.github.com>
Date: Mon, 12 Oct 2026 08:29:06 +0200
Subject: [PATCH] fix(calc): recalculate dependents of a cleared spill past
 65536 cells (#558)

---
 crates/calc/src/recalc.rs  |  4 ++--
 crates/engine/src/tests.rs | 11 +++++++++++
 2 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/crates/calc/src/recalc.rs b/crates/calc/src/recalc.rs
index 553e76440..b391821d7 100644
--- a/crates/calc/src/recalc.rs
+++ b/crates/calc/src/recalc.rs
@@ -898,11 +898,11 @@ impl Calc {
         // Spill areas of changed anchors also change.
         for &k in changed {
             if let Some(r) = wb.sheet(k.0).and_then(|s| s.spill_ranges.get(&k.1)) {
-                seeds.extend(r.iter().take(65536).map(|c| (k.0, c)));
+                seeds.extend(r.iter().map(|c| (k.0, c)));
             }
         }
         for (si, r) in &cleared {
-            seeds.extend(r.iter().take(65536).map(|c| (*si, c)));
+            seeds.extend(r.iter().map(|c| (*si, c)));
         }
         let t0 = prof_now();
         let dirty = self.dirty_closure(wb, &seeds);
diff --git a/crates/engine/src/tests.rs b/crates/engine/src/tests.rs
index 33fdc113e..634f8e2af 100644
--- a/crates/engine/src/tests.rs
+++ b/crates/engine/src/tests.rs
@@ -1617,6 +1617,17 @@ fn replacing_a_spilling_formula_clears_its_spill() {
     assert_eq!((v(&s, "A2"), v(&s, "B1")), (Value::Empty, Value::Number(0.0)));
 }
 
+#[test]
+fn clearing_a_spill_past_65536_cells_updates_a_late_dependent() {
+    let mut s = s();
+    s.execute("cell.set", json!({"cell": "A1", "input": "=SEQUENCE(65537)"})).unwrap();
+    s.execute("cell.set", json!({"cell": "C1", "input": "=A65536"})).unwrap();
+    s.execute("cell.set", json!({"cell": "C2", "input": "=A65537"})).unwrap();
+    assert_eq!(v(&s, "C2"), Value::Number(65537.0));
+    s.execute("cell.set", json!({"cell": "A1", "input": "5"})).unwrap();
+    assert_eq!((v(&s, "C1"), v(&s, "C2")), (Value::Number(0.0), Value::Number(0.0)));
+}
+
 #[test]
 fn range_ending_in_index_recalculates() {
     let mut s = s();