Recolor Artwork: rebuilt rows discard a slider edit's color mode

Changing the color count, a Preserve option or Limit to Library rebuilds the rows from the art's colors, which discards a slider edit. The dialog now also forgets that edit, so preview and OK give the art the rebuilt rows' colors in the art's own model instead of the rows' models.

crates/ui-egui/src/dialogs/recolor.rs

@@ -179,6 +179,9 @@ fn sync(app: &mut VectorcraftApp, d: &mut Dialog) {
             snap(app, d, &mut rows);
             d.fields.insert("rows".into(), Value::Array(rows));
             d.fields.insert("__sel".into(), json!([]));
+            // The new rows hold no slider edit.
+            d.fields.remove(SLID);
+            d.fields.remove(COMPS);
         }
         Err(e) => app.status(e.to_string()),
     }

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

@@ -492,6 +492,28 @@ fn reset_after_a_slider_edit_keeps_the_arts_model() {
     assert!(matches!(first_fill(h.state()).color(), Some(Color::Rgb { .. })), "the art stays RGB: {:?}", first_fill(h.state()));
 }
 
+/// A change of the color count rebuilds the rows and discards a slider edit: OK then gives RGB art
+/// a CMYK color group's color in RGB, as it does without the edit.
+#[test]
+fn a_new_color_count_after_a_slider_edit_keeps_the_arts_model() {
+    let mut app = app();
+    app.run("swatch.newGroup", json!({"name": "Mix", "colors": ["cmyk 0 100 0 0", "cmyk 100 0 0 0"], "keepModel": true})).unwrap();
+    art(&mut app, &["#ff00ff", "#00ffff"]);
+    let mut h = assign_harness(app, json!({"group": "Mix"}));
+    set(h.state_mut(), "__sel", json!([0]));
+    h.run_steps(2);
+    click_slider(&mut h, "C", 0.5);
+    assert_eq!(field(h.state(), "__slid"), json!(true), "the sliders edited the row");
+    set(h.state_mut(), "colors", json!(1));
+    h.run_steps(3);
+    assert_eq!(field(h.state(), "rows").as_array().map(Vec::len), Some(1), "the rows are rebuilt");
+    assert_eq!(field(h.state(), "__slid"), Value::Null, "the slider edit is discarded");
+    h.get_by_label("OK").click();
+    h.run_steps(2);
+    assert!(h.state().ui.dialog.is_none());
+    assert!(matches!(first_fill(h.state()).color(), Some(Color::Rgb { .. })), "the art stays RGB: {:?}", first_fill(h.state()));
+}
+
 /// The dialog keeps its height when the tab or the sliders' color mode changes.
 #[test]
 fn switching_tabs_or_slider_modes_keeps_the_dialog_height() {