From 3db5aebb33855df7e661f07e1c64e0bbac911338 Mon Sep 17 00:00:00 2001
From: Marco Arnulfo <marcoarnulfo1@gmail.com>
Date: Tue, 13 Oct 2026 03:47:24 +0200
Subject: [PATCH] Graph editor: speed graph handles keep dragging once their
 key leaves the plot (fixes #1171)

---
 crates/ui-egui/src/panels/graph.rs   |  5 ++++-
 crates/ui-egui/tests/ui_keyframes.rs | 28 ++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/crates/ui-egui/src/panels/graph.rs b/crates/ui-egui/src/panels/graph.rs
index 77e39c62..0ba5d2d1 100644
--- a/crates/ui-egui/src/panels/graph.rs
+++ b/crates/ui-egui/src/panels/graph.rs
@@ -376,7 +376,10 @@ pub(crate) fn show(app: &mut EffectcraftApp, ui: &mut egui::Ui, p: &egui::Painte
         let (lid, uid, d) = (c.layer.id, c.prop.uid, c.dim);
         for k in &c.keys {
             let kp = pos2(tm.x(k.t), ymap(k.v));
-            if !plot.expand(6.0).contains(kp) {
+            // In the speed graph an end key rises with the handle being dragged; skipping it once it
+            // leaves the plot would drop the handle's widget and end the drag at the top edge.
+            let handle_dragged = || ["in", "out"].iter().any(|side| ctx.is_being_dragged(egui::Id::new(("ghandle", uid, d, k.idx, *side))));
+            if !plot.expand(6.0).contains(kp) && !handle_dragged() {
                 continue;
             }
             let kjson = json!({"layer": lid.0, "prop": uid, "time": k.time.seconds()});
diff --git a/crates/ui-egui/tests/ui_keyframes.rs b/crates/ui-egui/tests/ui_keyframes.rs
index 74352824..e5b2cae9 100644
--- a/crates/ui-egui/tests/ui_keyframes.rs
+++ b/crates/ui-egui/tests/ui_keyframes.rs
@@ -435,3 +435,31 @@ fn ctrl_alt_scrub_in_the_timeline_is_proportional() {
     assert!(moved[0].abs() < 1e-9, "the first selected layer stays: {moved:?}");
     assert!((moved[1] - moved[2] / 2.0).abs() < 1e-6, "the middle one moves by half: {moved:?}");
 }
+
+/// #1171: in the speed graph an end key sits at its one side's speed, so it rises with the handle
+/// being dragged; once it left the plot its handles were skipped and the drag stopped at the top
+/// edge. A drag that ends above the graph keeps raising the speed as far as the pointer goes.
+#[test]
+fn speed_graph_handle_drags_upward_past_the_top() {
+    let (mut h, id, uid) = harness();
+    let s = &mut h.state_mut().session;
+    s.execute("prop.select", json!({"layer": id.0, "prop": uid})).unwrap();
+    s.execute("keys.selectAll", json!({})).unwrap();
+    s.execute("keys.easyEase", json!({})).unwrap();
+    h.state_mut().ui.timeline.graph_editor = true;
+    h.state_mut().ui.timeline.graph_mode = "speed".into();
+    h.run_steps(4);
+    let out_speed = |h: &Harness<'_, EffectcraftApp>| {
+        h.state().session.active_comp().unwrap().layer(id).unwrap().props.prop("transform/opacity").unwrap().keys[0].out_ease[0].speed
+    };
+    let e = h.state().auto.find(&format!("timeline.graph.handle.{uid}.0.0.out")).cloned().expect("the first key's out handle shows");
+    let at = pos2(e.rect[0] + e.rect[2] / 2.0, e.rect[1] + e.rect[3] / 2.0);
+    drag(&mut h, at, at + egui::vec2(0.0, -40.0), Default::default());
+    let short = out_speed(&h);
+    h.state_mut().session.execute("edit.undo", json!({})).unwrap();
+    h.run_steps(4);
+    assert_eq!(out_speed(&h), 0.0);
+    drag(&mut h, at, at + egui::vec2(0.0, -400.0), Default::default());
+    let long = out_speed(&h);
+    assert!(short > 1.0 && long > 9.0 * short, "40 px up gave {short}, 400 px up gave {long}");
+}