--- old/src/java.desktop/unix/classes/sun/awt/X11/XTextFieldPeer.java	2018-12-03 13:23:09.040524938 +0900
+++ new/src/java.desktop/unix/classes/sun/awt/X11/XTextFieldPeer.java	2018-12-03 13:23:08.640511978 +0900
@@ -281,13 +281,16 @@
 
     @Override
     public void setFont(Font f) {
+        boolean isChanged = false;
         synchronized (getStateLock()) {
             font = f;
             if (xtext != null && xtext.getFont() != f) {
                 xtext.setFont(font);
+                isChanged = true;
             }
         }
-        xtext.validate();
+        if (isChanged)
+            xtext.validate();
     }
 
     /**
--- /dev/null	2018-10-10 12:11:41.620000480 +0900
+++ new/test/jdk/java/awt/TextField/FontChangeTest/FontChangeTest.java	2018-12-03 13:23:09.200530122 +0900
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2018, 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.
+ */
+
+/*
+ * @bug 8211267
+ * @summary verifies TextField.setFont()
+ */
+
+import java.awt.EventQueue;
+import java.awt.Font;
+import java.awt.Frame;
+import java.awt.Panel;
+import java.awt.TextField;
+import java.awt.BorderLayout;
+import java.awt.FlowLayout;
+
+public class FontChangeTest {
+    static Frame frame;
+    static Panel p1;
+    static TextField tf1;
+    static boolean failed = false;
+
+    public static void main(String[] args) throws Exception {
+        EventQueue.invokeAndWait(new Runnable() {
+            @Override
+            public void run() {
+                 try {
+                     testFont1();
+                 } catch (StackOverflowError soe) {
+                     failed = true;
+                 }
+            }
+        });
+        frame.dispose();
+        if (failed) {
+            throw new Exception("Test failed");
+        }
+    }
+
+    private static void testFont1() {
+        frame = new Frame();
+        frame.setLayout(new BorderLayout());
+        p1 = new Panel();
+        p1.setLayout(new FlowLayout());
+        tf1 = new TextField("ABC");
+        tf1.setFont(new Font("Dialog", Font.PLAIN, 12));
+        p1.add(tf1);
+        frame.add(p1, BorderLayout.CENTER);
+        frame.pack();
+        frame.setVisible(true);
+        p1.setVisible(false);
+        tf1.setText("xyz");
+        tf1.setFont(new Font("Dialog", Font.PLAIN, 24));
+        p1.setVisible(true);
+        frame.pack();
+    }
+}