Disarm color picking when adding mask components

Fixes #3178

Co-Authored-By: GPT-6-Luna <noreply@openai.com>

crates/ui-egui/src/app.rs

@@ -221,6 +221,10 @@ impl LightcraftApp {
             // menu), it must not keep a search that no longer applies (issue #1648)
             self.ui.search.clear();
         }
+        if r.is_ok() && id == "mask.addComponent" && params.get("kind").and_then(Value::as_str) != Some("colorRange") && self.ui.tool == "colorRange"
+        {
+            self.ui.tool.clear();
+        }
         if r.is_ok() && id == "mask.adjust" {
             // Judge local adjustments on the photo, without the selection overlay obscuring them.
             // Keep it hidden after release; O / the overlay eye can show it again.

crates/ui-egui/src/tests/masking.rs

@@ -1700,6 +1700,28 @@ fn assert_close(a: &serde_json::Value, b: &serde_json::Value) {
 
 /// Regression: the Colour Range "Pick" button armed the eyedropper, but with the Masking panel
 /// open the loupe's clicks went to the mask overlay, so no sample was ever taken.
+#[test]
+fn adding_radial_component_disarms_color_range_picker() {
+    let mut h = detail("panel.masking");
+    exec(&mut h, "mask.add", json!({"kind": "colorRange"}));
+    h.app.ui.tool.clear();
+    click(&mut h, "button:colorPick0");
+    brush_at(&mut h, 0.25, 0.5);
+    assert_eq!(color_samples(&h).as_array().map(Vec::len), Some(1));
+
+    exec(&mut h, "mask.addComponent", json!({"kind": "radial", "op": "intersect", "center": [0.5, 0.5], "rx": 0.22, "ry": 0.22}));
+    assert!(h.app.ui.tool.is_empty(), "adding a radial component disarms colour picking");
+
+    let widget = "maskHandle:1:1:1";
+    let rect = h.app.widgets.iter().find(|(id, _)| *id == widget).unwrap().1;
+    let image = h.app.image_rect.unwrap();
+    let q = rect.center();
+    let (x, y) = ((q.x - image.left()) / image.width(), (q.y - image.top()) / image.height());
+    pointer(&mut h, json!([{"kind": "down", "x": x, "y": y}, {"kind": "drag", "x": x + 0.05, "y": y}, {"kind": "up", "x": x + 0.05, "y": y}]));
+    let MaskShape::Radial { rx, .. } = develop(&h).masks[0].components[1].shape else { panic!("radial") };
+    assert!(rx > 0.22, "dragging a radial handle resizes the component: {rx}");
+}
+
 #[test]
 fn color_range_pick_button_samples_the_photo() {
     let mut h = detail("panel.masking");