JRE-9: added regression test

(cherry picked from commit 4ffb665)
(cherry picked from commit 00a29ad129)

with fix for JBR-5300 Change source code and test files to use GPL license

(cherry picked from commit 05ad949ded)

test/jdk/jb/javax/swing/JEditorPane/LargeQuickDoc.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2000-2023 JetBrains s.r.o.
+ * 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.
+ */
+
+import javax.swing.JEditorPane;
+import javax.swing.JFrame;
+import javax.swing.JScrollPane;
+import javax.swing.SwingUtilities;
+import javax.swing.text.html.HTMLEditorKit;
+import java.io.IOException;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+
+/* @test
+ * @bug 8151725
+ * @summary regression test on JRE-9
+ */
+
+public class LargeQuickDoc {
+
+    static private String getText() throws IOException {
+        return new String(
+                Files.readAllBytes(
+                        FileSystems.getDefault().getPath(
+                                System.getProperty("test.src", "."), "LargeQuickDoc.txt")));
+    }
+
+
+    public static void main(String[] args) throws Exception {
+        SwingUtilities.invokeAndWait(() -> {
+
+            JFrame f = new JFrame();
+            JEditorPane editorPane = new javax.swing.JEditorPane("text/html", "");
+            editorPane.setEditorKit(new HTMLEditorKit());
+            editorPane.setEditable(false);
+
+            JScrollPane scrollPane = new JScrollPane(editorPane);
+            scrollPane.setBorder(null);
+
+            try {
+                editorPane.setText(getText());
+            } catch (IOException | ArrayIndexOutOfBoundsException e) {
+                throw new RuntimeException(e);
+            }
+
+            f.getContentPane().add(scrollPane);
+            f.setSize(500, 500);
+            f.setVisible(true);
+        });
+    }
+}