Fix Material Editor scrolling by removing hardcoded preferred size

Co-authored-by: neph1 <7988802+neph1@users.noreply.github.com>

Author: Copilot

jme3-materialeditor/src/com/jme3/gde/materials/multiview/MaterialEditorTopComponent.form

@@ -75,11 +75,6 @@
           <Layout class="org.netbeans.modules.form.compat2.layouts.support.JScrollPaneSupportLayout"/>
           <SubComponents>
             <Container class="javax.swing.JPanel" name="editorPanel">
-              <Properties>
-                <Property name="preferredSize" type="java.awt.Dimension" editor="org.netbeans.beaninfo.editors.DimensionEditor">
-                  <Dimension value="[0, 0]"/>
-                </Property>
-              </Properties>
 
               <Layout>
                 <DimensionLayout dim="0">

jme3-materialeditor/src/com/jme3/gde/materials/multiview/MaterialEditorTopComponent.java

@@ -200,8 +200,6 @@ private void initComponents() {
 
         jScrollPane4.setPreferredSize(new java.awt.Dimension(0, 0));
 
-        editorPanel.setPreferredSize(new java.awt.Dimension(0, 0));
-
         texturesAndColorsPane.setTabLayoutPolicy(javax.swing.JTabbedPane.SCROLL_TAB_LAYOUT);
         texturesAndColorsPane.setMinimumSize(new java.awt.Dimension(150, 31));
         texturesAndColorsPane.setPreferredSize(new java.awt.Dimension(480, 355));

jme3-materialeditor/test/unit/src/com/jme3/gde/materials/multiview/MaterialEditorScrollTest.java

@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2009-2023 jMonkeyEngine
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ *
+ * * Neither the name of 'jMonkeyEngine' nor the names of its contributors
+ *   may be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package com.jme3.gde.materials.multiview;
+
+import static org.junit.jupiter.api.Assertions.assertNotEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import org.junit.jupiter.api.Test;
+import java.awt.Dimension;
+import java.awt.EventQueue;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Field;
+import javax.swing.JPanel;
+import org.openide.util.Exceptions;
+
+/**
+ * Test for Material Editor scrolling functionality
+ * @author copilot
+ */
+public class MaterialEditorScrollTest {
+    
+    public MaterialEditorScrollTest() {
+    }
+    
+    @Test
+    public void testEditorPanelDoesNotHaveHardcodedZeroSize() {
+        MaterialEditorTopComponent editor = new MaterialEditorTopComponent();
+        
+        try {
+            EventQueue.invokeAndWait(() -> {
+                // Access the editorPanel via reflection to check it doesn't have hardcoded (0,0) size
+                try {
+                    Field editorPanelField = MaterialEditorTopComponent.class.getDeclaredField("editorPanel");
+                    editorPanelField.setAccessible(true);
+                    JPanel editorPanel = (JPanel) editorPanelField.get(editor);
+                    
+                    // The panel should not have a hardcoded (0,0) preferred size
+                    Dimension preferredSize = editorPanel.getPreferredSize();
+                    
+                    // The preferred size should not be exactly (0,0) as that was the bug
+                    // Note: it might still be (0,0) if no components are added yet, but it should not be hardcoded
+                    // We can't test the exact size since it depends on content, but we can ensure it's not artificially set to (0,0)
+                    
+                    // The key test is that when components are added, the preferred size should grow
+                    // For now, we just ensure the panel exists and can calculate a preferred size
+                    assertTrue(preferredSize != null, "Preferred size should not be null");
+                    
+                    // Add a dummy component to test that preferred size calculation works
+                    editorPanel.add(new javax.swing.JLabel("Test"));
+                    editorPanel.revalidate();
+                    
+                    Dimension newPreferredSize = editorPanel.getPreferredSize();
+                    // Now it should have a non-zero size since we added a component
+                    assertTrue(newPreferredSize.width > 0 || newPreferredSize.height > 0, 
+                            "Preferred size should grow when components are added");
+                    
+                } catch (NoSuchFieldException | IllegalAccessException ex) {
+                    Exceptions.printStackTrace(ex);
+                }
+            });
+        } catch (InterruptedException | InvocationTargetException ex) {
+            Exceptions.printStackTrace(ex);
+        }
+    }
+}