LR-CROP-STRAIGHTEN: the Angle field applies a typed angle on Return

The field applied every keystroke: an undo step and a render per key,
and half-typed angles (-3° on the way to -3.25°). It now applies on
Return or when focus leaves, as one undo step, and ignores changes that
leave the angle as it is.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/panels/right.rs

@@ -196,14 +196,19 @@ fn crop(app: &mut LightcraftApp, ui: &mut egui::Ui, id: PhotoId) {
                         .clamp_existing_to_range(false)
                         .speed(0.05)
                         .fixed_decimals(2)
-                        .suffix("°"),
+                        .suffix("°")
+                        // a typed angle applies on Return (or leaving the field), not keystroke by
+                        // keystroke: no half-typed angles, one undo step
+                        .update_while_editing(false),
                 );
                 crate::widgets::register(ui.ctx(), "cropAngleField", r.rect);
                 // a drag on the field is one undo step, like the slider's
                 if r.drag_started() {
                     let _ = app.run("develop.beginInteraction", json!({"label": "Straighten"}));
                 }
-                if r.changed() && angle.is_finite() {
+                // egui reports a change while text is typed even when the value isn't updated yet:
+                // apply only a new angle
+                if r.changed() && angle.is_finite() && angle != d.crop.geometry.angle {
                     let _ = app.run("crop.straighten", json!({"angle": (angle.clamp(spec.min, spec.max) * 100.0).round() / 100.0}));
                 }
                 if r.drag_stopped() {

crates/ui-egui/src/tests_crop_rotate.rs

@@ -179,6 +179,33 @@ fn dragging_the_angle_field_is_one_undo_step() {
     assert_eq!(h.app.session.undo.len(), undo + 1, "one step for the whole drag");
 }
 
+/// Typing into the Angle field one key at a time applies the angle once, on Return: no undo step
+/// or render per keystroke, no half-typed angles (-3° on the way to -3.25°).
+#[test]
+fn typing_in_the_angle_field_applies_on_return() {
+    let mut h = crop_tool();
+    let r = h.request("ui.clickWidget", json!({"id": "cropAngleField"}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    h.settle(SETTLE);
+    for key in ["a", "Backspace"] {
+        let r = h.request("ui.key", json!({"key": key, "cmd": key == "a"}), T);
+        assert_eq!(r["ok"], true, "{r}");
+    }
+    h.settle(SETTLE);
+    let (before, undo) = (angle(&h), h.app.session.undo.len());
+    for ch in ["-", "3", ".", "2", "5"] {
+        let r = h.request("ui.text", json!({"text": ch}), T);
+        assert_eq!(r["ok"], true, "{r}");
+        h.settle(SETTLE);
+    }
+    assert_eq!((angle(&h), h.app.session.undo.len()), (before, undo), "nothing applied while typing");
+    let r = h.request("ui.key", json!({"key": "Enter"}), T);
+    assert_eq!(r["ok"], true, "{r}");
+    h.settle(SETTLE);
+    assert!((angle(&h) + 3.25).abs() < 1e-9, "applied on Return: {}", angle(&h));
+    assert_eq!(h.app.session.undo.len(), undo + 1, "as one undo step");
+}
+
 /// Rotating in the margin beside a narrow photo keeps the readout next to the pointer: it is kept
 /// on the canvas, not pinned to the photo's edge.
 #[test]