7154070: in SwingSet2, switching between LaFs it's easy to lose JTable dividers

6788475: Changing to Nimbus LAF and back doesn't reset look and feel of JTable completely

Reviewed-by: tr, abhiscxk, honkar, jdv

src/java.desktop/share/classes/javax/swing/plaf/synth/SynthTableUI.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2023, 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
@@ -86,6 +86,8 @@ public class SynthTableUI extends BasicTableUI
     private TableCellRenderer booleanRenderer;
     private TableCellRenderer objectRenderer;
 
+    private boolean showHorizLines;
+    private boolean showVertLines;
 //
 //  The installation/uninstall procedures and support
 //
@@ -178,10 +180,10 @@ public class SynthTableUI extends BasicTableUI
             if (rowHeight != null) {
                 LookAndFeel.installProperty(table, "rowHeight", rowHeight);
             }
+            showHorizLines = table.getShowHorizontalLines();
+            showVertLines = table.getShowVerticalLines();
             boolean showGrid = style.getBoolean(context, "Table.showGrid", true);
-            if (!showGrid) {
+            table.setShowGrid(showGrid);
-                table.setShowGrid(false);
-            }
             Dimension d = table.getIntercellSpacing();
 //            if (d == null || d instanceof UIResource) {
             if (d != null) {
@@ -227,6 +229,8 @@ public class SynthTableUI extends BasicTableUI
             table.setTransferHandler(null);
         }
         SynthContext context = getContext(table, ENABLED);
+        table.setShowHorizontalLines(showHorizLines);
+        table.setShowVerticalLines(showVertLines);
         style.uninstallDefaults(context);
         style = null;
     }

test/jdk/javax/swing/JTable/TestJTableGridReset.java

@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2023, 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.
+ *
+ * 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.
+ */
+/*
+ * @test
+ * @bug 7154070
+ * @key headful
+ * @summary  Verifies if switching between LaFs JTable dividers setting are not lost
+ * @run main TestJTableGridReset
+ */
+
+import javax.swing.JTable;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+import javax.swing.UnsupportedLookAndFeelException;
+
+public class TestJTableGridReset {
+
+    private static JTable table;
+    private static volatile boolean origHorizLines;
+    private static volatile boolean origVertLines;
+    private static volatile boolean curHorizLines;
+    private static volatile boolean curVertLines;
+
+    private static void setLookAndFeel(UIManager.LookAndFeelInfo laf) {
+        try {
+            UIManager.setLookAndFeel(laf.getClassName());
+        } catch (UnsupportedLookAndFeelException ignored) {
+            System.out.println("Unsupported L&F: " + laf.getClassName());
+        } catch (ClassNotFoundException | InstantiationException
+                | IllegalAccessException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static void main(String[] args) throws Exception {
+        for (UIManager.LookAndFeelInfo laf :
+                 UIManager.getInstalledLookAndFeels()) {
+            System.out.println("Testing L&F: " + laf.getClassName());
+            SwingUtilities.invokeAndWait(() -> {
+                setLookAndFeel(laf);
+                table = new JTable();
+                table.setShowHorizontalLines(true);
+                table.setShowVerticalLines(true);
+                SwingUtilities.updateComponentTreeUI(table);
+                origHorizLines = table.getShowHorizontalLines();
+                origVertLines = table.getShowVerticalLines();
+            });
+            UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
+            SwingUtilities.invokeAndWait(() -> {
+                SwingUtilities.updateComponentTreeUI(table);
+                setLookAndFeel(laf);
+                SwingUtilities.updateComponentTreeUI(table);
+                curHorizLines = table.getShowHorizontalLines();
+                curVertLines = table.getShowVerticalLines();
+            });
+            System.out.println("origHorizLines " + origHorizLines +
+                               " origVertLines " + origVertLines);
+            System.out.println("curHorizLines " + curHorizLines +
+                                " curVertLines " + curVertLines);
+            if (origHorizLines != curHorizLines ||
+                origVertLines != curVertLines) {
+                throw new RuntimeException("Horizontal/Vertical grid lines not restored");
+            }
+        }
+    }
+}
+