diff -r 000000000000 -r 959103a6100f test/com/sun/javadoc/testSourceTab/TestSourceTab.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/com/sun/javadoc/testSourceTab/TestSourceTab.java	Wed Apr 27 01:34:52 2016 +0800
@@ -0,0 +1,138 @@
+/*
+ * Copyright (c) 2002, 2008, 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 4510979
+ * @summary Test to make sure that the source documentation is indented properly
+ * when -linksourcetab is used.
+ * @author jamieh
+ * @library ../lib/
+ * @build JavadocTester
+ * @build TestSourceTab
+ * @run main TestSourceTab
+ */
+
+import java.io.*;
+
+public class TestSourceTab extends JavadocTester {
+
+    private static final String BUG_ID = "4510979";
+    private static final String TMP_SRC_DIR = "tmpSrc";
+    private static final String OUTPUT_DIR1 = BUG_ID + "-tabLengthEight";
+    private static final String OUTPUT_DIR2 = BUG_ID + "-tabLengthFour";
+    private static final String[][] TEST = NO_TEST;
+    private static final String[][] NEGATED_TEST = NO_TEST;
+
+    //Run Javadoc on a source file with that is indented with a single tab per line
+    private static final String[] ARGS1 =
+        new String[] {
+            "-d", OUTPUT_DIR1, "-sourcepath", TMP_SRC_DIR,
+            "-notimestamp", "-linksource", TMP_SRC_DIR + FS + "SingleTab" + FS + "C.java"
+        };
+
+    //Run Javadoc on a source file with that is indented with a two tab per line
+    //If we double the tabs and decrease the tab length by a half, the output should
+    //be the same as the one generated above.
+    private static final String[] ARGS2 =
+        new String[] {
+            "-d", OUTPUT_DIR2, "-sourcepath", TMP_SRC_DIR,
+            "-notimestamp", "-sourcetab", "4", TMP_SRC_DIR + FS + "DoubleTab" + FS + "C.java"
+        };
+
+    //Files to diff
+    private static final String[][] FILES_TO_DIFF = {
+        {OUTPUT_DIR1 + FS + "src-html" + FS + "C.html",
+         OUTPUT_DIR2 + FS + "src-html" + FS + "C.html"
+        },
+        {OUTPUT_DIR1 + FS + "C.html",
+         OUTPUT_DIR2 + FS + "C.html"
+        }
+
+    };
+
+    /**
+     * The entry point of the test.
+     * @param args the array of command line arguments.
+     */
+    public static void main(String[] args) throws IOException {
+        TestSourceTab tester = new TestSourceTab();
+        run(tester, ARGS1, TEST, NEGATED_TEST);
+        run(tester, ARGS2, TEST, NEGATED_TEST);
+        tester.runDiffs(FILES_TO_DIFF);
+    }
+
+    TestSourceTab() throws IOException {
+        initTabs(new File(SRC_DIR), new File(TMP_SRC_DIR));
+    }
+
+    void initTabs(File from, File to) throws IOException {
+        for (File f: from.listFiles()) {
+            File t = new File(to, f.getName());
+            if (f.isDirectory()) {
+                initTabs(f, t);
+            } else if (f.getName().endsWith(".java")) {
+                write(t, read(f).replace("\\t", "\t"));
+            }
+        }
+    }
+
+    String read(File f) throws IOException {
+        StringBuilder sb = new StringBuilder();
+        BufferedReader in = new BufferedReader(new FileReader(f));
+        try {
+            String line;
+            while ((line = in.readLine()) != null) {
+                sb.append(line);
+                sb.append("\n");
+            }
+        } finally {
+            in.close();
+        }
+        return sb.toString();
+    }
+
+    void write(File f, String s) throws IOException {
+        f.getParentFile().mkdirs();
+        Writer out = new FileWriter(f);
+        try {
+            out.write(s);
+        } finally {
+            out.close();
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public String getBugId() {
+        return BUG_ID;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public String getBugName() {
+        return getClass().getName();
+    }
+}