8266966: Wrong CSS properties are applied to other nodes after fix fo…

…r JDK-8204568

Backport-of: 93de5840b19868fbe8850b846418c3f6f72df256

modules/javafx.graphics/src/main/java/javafx/scene/CssStyleHelper.java

@@ -450,12 +450,15 @@ private StyleMap getStyleMap(Styleable styleable) {
         private boolean forceSlowpath = false;
     }
 
+    private boolean resetInProgress = false;
+
     private void resetToInitialValues(final Styleable styleable) {
 
         if (cacheContainer == null ||
                 cacheContainer.cssSetProperties == null ||
                 cacheContainer.cssSetProperties.isEmpty()) return;
 
+        resetInProgress = true;
         // RT-31714 - make a copy of the entry set and clear the cssSetProperties immediately.
         Set<Entry<CssMetaData, CalculatedValue>> entrySet = new HashSet<>(cacheContainer.cssSetProperties.entrySet());
         cacheContainer.cssSetProperties.clear();
@@ -471,6 +474,7 @@ private void resetToInitialValues(final Styleable styleable) {
                 styleableProperty.applyStyle(calculatedValue.getOrigin(), calculatedValue.getValue());
             }
         }
+        resetInProgress = false;
     }
 
 
@@ -586,9 +590,20 @@ private Set<PseudoClass>[] getTransitionStates(final Node node) {
     // Any modifications to the method transitionToState() should be applied here if needed.
     void recalculateRelativeSizeProperties(final Node node, Font fontForRelativeSizes) {
 
-        if (transitionStateInProgress) {
-            // If transitionToState() is being executed for the current control then all the css properties will get
-            // calculated there, and so we need to do anything here.
+        if (transitionStateInProgress || resetInProgress) {
+            // It is not required to recalculate the relative sized properties,
+            // 1. [transitionStateInProgress]: if transitionToState() is being executed for the current control then all
+            //    the css properties will get calculated there, OR
+            // 2. [resetInProgress]: if resetToInitialValues() is being executed, which sets font to default font.
+            //    The css style set by user if any is applied post this reset which calls
+            //    recalculateRelativeSizeProperties() again.
+            //    JDK-8266966: StyleManager.styleMapList stores the StyleMaps of nodes using an id as key.
+            //    Each node stores this id in CssStyleHelper.CacheContainer.smapId
+            //    CssStyleHelper.getStyleMap(node) gets a StyleMap from StyleManager.styleMapList by using the
+            //    CssStyleHelper.CacheContainer.smapId as key.
+            //    When resetToInitialValues() is in progress, the StyleManager.styleMapList gets updated, therefore
+            //    calls to getStyleMap(node) should be avoided, as it may return an incorrect StyleMap for a given node.
+
             return;
         }
         if (cacheContainer == null) {

tests/system/src/test/java/test/javafx/scene/CssStyleHelperTest.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2021, 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;
+
+import javafx.application.Application;
+import javafx.application.Platform;
+import javafx.scene.Scene;
+import javafx.scene.control.Label;
+import javafx.scene.control.Button;
+import javafx.scene.control.CheckBox;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.TimeUnit;
+
+import junit.framework.Assert;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import test.util.Util;
+import static org.junit.Assert.assertTrue;
+
+public class CssStyleHelperTest {
+
+    private static CountDownLatch startupLatch;
+    private static StackPane root;
+    private static Stage stage;
+    private static Label label1;
+    private static Button button;
+    private static CheckBox checkBox;
+    private static Label label2;
+
+    public static class TestApp extends Application {
+        @Override
+        public void start(Stage primaryStage) throws Exception {
+            stage = primaryStage;
+            label1 = new Label("Label1");
+            button = new Button("aButton");
+            checkBox = new CheckBox("aCheckBox");
+            label2 = new Label("Label2");
+
+            root = new StackPane();
+            root.getChildren().addAll(label1, button, checkBox, label2);
+            Scene scene = new Scene(root, 200, 200);
+            scene.getStylesheets().add(getClass().getResource("RootFont.css").toExternalForm());
+            primaryStage.setScene(scene);
+            primaryStage.setOnShown(l -> {
+                Platform.runLater(() -> startupLatch.countDown());
+            });
+            primaryStage.show();
+        }
+    }
+
+    @BeforeClass
+    public static void initFX() throws Exception {
+        startupLatch = new CountDownLatch(1);
+        new Thread(() -> Application.launch(TestApp.class, (String[]) null)).start();
+        assertTrue("Timeout waiting for FX runtime to start",
+                   startupLatch.await(15, TimeUnit.SECONDS));
+    }
+
+    @Test
+    public void testCssIsCorrectlyAppliedToLabelOnStageHideAndShow() throws Exception {
+        // sanity
+        Assert.assertNull("Label1 should have no background", label1.getBackground());
+        Assert.assertNull("Label2 should have no background", label2.getBackground());
+
+        startupLatch = new CountDownLatch(1);
+        Util.runAndWait(() -> {
+            stage.hide();
+            stage.show();
+        });
+        assertTrue("Timeout waiting for Stage to show after hide",
+                   startupLatch.await(15, TimeUnit.SECONDS));
+
+        Assert.assertNull("Label1 should have no background", label1.getBackground());
+        Assert.assertNull("Label2 should have no background", label2.getBackground());
+    }
+
+    @AfterClass
+    public static void teardownOnce() {
+        Platform.runLater(() -> {
+            stage.hide();
+            Platform.exit();
+        });
+    }
+}

tests/system/src/test/resources/test/javafx/scene/RootFont.css

@@ -0,0 +1,3 @@
+.root {
+    -fx-font-size: 50px;
+}