8388277: [REDO] Looked-up color fails for -fx-background-color in JavaFX CSS file

modules/javafx.controls/src/test/java/test/javafx/scene/control/css/ControlCssTest.java

@@ -0,0 +1,155 @@
+/*
+ * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package test.javafx.scene.control.css;
+
+import com.sun.javafx.tk.Toolkit;
+import javafx.css.CssParser;
+import javafx.scene.Parent;
+import javafx.scene.Scene;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.scene.control.Tab;
+import javafx.scene.control.TabPane;
+import javafx.scene.layout.Pane;
+import javafx.scene.layout.StackPane;
+import javafx.scene.layout.VBox;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+import test.com.sun.javafx.scene.control.infrastructure.StageLoader;
+
+import java.nio.charset.StandardCharsets;
+import java.util.Base64;
+import java.util.concurrent.atomic.AtomicBoolean;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * Tests CSS together with Controls and their Skins.
+ */
+public class ControlCssTest {
+
+    private StageLoader stageLoader;
+
+    @AfterEach
+    void tearDown() {
+        if (stageLoader != null) {
+            stageLoader.dispose();
+        }
+    }
+
+    /**
+     * When we swap the root of a scene, it should still correctly resolve the CSS.
+     */
+    @Test
+    void testLookupResolvesAfterSceneListenerRootSwap() {
+        var errors = CssParser.errorsProperty();
+        errors.clear();
+
+        TabPane tabPane = new TabPane();
+        Label label = new Label("Test");
+        tabPane.getTabs().add(new Tab("TestTab", label));
+
+        AtomicBoolean swapped = new AtomicBoolean(false);
+        label.sceneProperty().addListener((_, _, newScene) -> {
+            if (newScene != null && !swapped.getAndSet(true)) {
+                Parent oldRoot = newScene.getRoot();
+                StackPane newRoot = new StackPane();
+                newScene.setRoot(newRoot);
+                newRoot.getChildren().setAll(oldRoot);
+            }
+        });
+
+        Button btn = new Button("Add Child");
+        VBox root = new VBox(btn);
+        btn.setOnAction(_ -> root.getChildren().add(tabPane));
+
+        stageLoader = new StageLoader(new Scene(root));
+
+        btn.fire();
+        Toolkit.getToolkit().firePulse();
+
+        assertEquals(0, errors.size(), errors::toString);
+    }
+
+    /**
+     * When we swap a pane with a style class, the CSS for the children based of the Pane should correctly resolve.
+     */
+    @Test
+    void testPaneClassLookupResolvesAfterSceneListenerPaneSwap() {
+        var errors = CssParser.errorsProperty();
+        errors.clear();
+
+        String theme = toBase64("""
+                .my-pane {
+                    -color: #1B2631;
+                }
+                .my-pane .label {
+                    -fx-text-fill: -color;
+                }
+                """);
+
+        TabPane tabPane = new TabPane();
+        Label label = new Label("Test");
+        tabPane.getTabs().add(new Tab("TestTab", label));
+
+        StackPane myPane = new StackPane();
+        myPane.getStyleClass().add("my-pane");
+
+        AtomicBoolean swapped = new AtomicBoolean(false);
+        label.sceneProperty().addListener((_, _, newScene) -> {
+            if (newScene != null && !swapped.getAndSet(true)) {
+                StackPane newPaneRoot = new StackPane();
+                Pane paneRoot = (Pane) myPane.getParent();
+
+                paneRoot.getChildren().remove(myPane);
+                paneRoot.getChildren().add(newPaneRoot);
+
+                myPane.getStyleClass().remove("my-pane");
+                newPaneRoot.getStyleClass().add("my-pane");
+
+                newPaneRoot.getChildren().setAll(myPane);
+            }
+        });
+
+        Button btn = new Button("Add Child");
+        VBox root = new VBox(btn, myPane);
+        btn.setOnAction(_ -> myPane.getChildren().add(tabPane));
+
+        Scene scene = new Scene(root);
+        scene.getStylesheets().add(theme);
+        stageLoader = new StageLoader(scene);
+
+        btn.fire();
+        Toolkit.getToolkit().firePulse();
+
+        assertEquals(0, errors.size(), errors::toString);
+    }
+
+    private static String toBase64(String css) {
+        return "data:text/css;base64," + Base64.getEncoder().encodeToString(css.getBytes(StandardCharsets.UTF_8));
+    }
+
+}