--- a/mercurial/hgweb/webcommands.py	Mon Apr 24 18:33:23 2017 +0200
+++ b/mercurial/hgweb/webcommands.py	Mon Apr 24 10:32:15 2017 +0200
@@ -131,6 +131,7 @@
     f = fctx.path()
     text = fctx.data()
     parity = paritygen(web.stripecount)
+    ishead = fctx.filerev() in fctx.filelog().headrevs()
 
     if util.binary(text):
         mt = mimetypes.guess_type(f)[0] or 'application/octet-stream'
@@ -150,6 +151,7 @@
                 symrev=webutil.symrevorshortnode(req, fctx),
                 rename=webutil.renamelink(fctx),
                 permissions=fctx.manifest().flags(f),
+                ishead=int(ishead),
                 **webutil.commonentry(web.repo, fctx))
 
 @webcommand('file')

--- a/mercurial/templates/gitweb/filerevision.tmpl	Mon Apr 24 18:33:23 2017 +0200
+++ b/mercurial/templates/gitweb/filerevision.tmpl	Mon Apr 24 10:32:15 2017 +0200
@@ -64,7 +64,7 @@
 </div>
 
 <div class="page_body">
-<pre class="sourcelines stripes" data-logurl="{url|urlescape}log/{symrev}/{file|urlescape}">{text%fileline}</pre>
+<pre class="sourcelines stripes" data-logurl="{url|urlescape}log/{symrev}/{file|urlescape}" data-ishead="{ishead}">{text%fileline}</pre>
 </div>
 
 <script type="text/javascript" src="{staticurl|urlescape}followlines.js"></script>

--- a/mercurial/templates/paper/filerevision.tmpl	Mon Apr 24 18:33:23 2017 +0200
+++ b/mercurial/templates/paper/filerevision.tmpl	Mon Apr 24 10:32:15 2017 +0200
@@ -71,7 +71,7 @@
 <div class="overflow">
 <div class="sourcefirst linewraptoggle">line wrap: <a class="linewraplink" href="javascript:toggleLinewrap()">on</a></div>
 <div class="sourcefirst"> line source</div>
-<pre class="sourcelines stripes4 wrap bottomline" data-logurl="{url|urlescape}log/{symrev}/{file|urlescape}">{text%fileline}</pre>
+<pre class="sourcelines stripes4 wrap bottomline" data-logurl="{url|urlescape}log/{symrev}/{file|urlescape}" data-ishead="{ishead}">{text%fileline}</pre>
 </div>
 
 <script type="text/javascript" src="{staticurl|urlescape}followlines.js"></script>

--- a/mercurial/templates/static/followlines.js	Mon Apr 24 18:33:23 2017 +0200
+++ b/mercurial/templates/static/followlines.js	Mon Apr 24 10:32:15 2017 +0200
@@ -17,6 +17,8 @@
         return;
     }
 
+    var isHead = parseInt(sourcelines.dataset.ishead || "0");
+
     // tooltip to invite on lines selection
     var tooltip = document.createElement('div');
     tooltip.id = 'followlines-tooltip';
@@ -153,7 +155,7 @@
 
             // append the <div id="followlines"> element to last line of the
             // selection block
-            var divAndButton = followlinesBox(targetUri, startId, endId);
+            var divAndButton = followlinesBox(targetUri, startId, endId, isHead);
             var div = divAndButton[0],
                 button = divAndButton[1];
             inviteElement.appendChild(div);
@@ -186,7 +188,7 @@
     sourcelines.addEventListener('click', lineSelectStart);
 
     //** return a <div id="followlines"> and inner cancel <button> elements */
-    function followlinesBox(targetUri, fromline, toline) {
+    function followlinesBox(targetUri, fromline, toline, isHead) {
         // <div id="followlines">
         var div = document.createElement('div');
         div.id = 'followlines';
@@ -213,13 +215,16 @@
         aAsc.setAttribute('href', url);
         aAsc.textContent = 'ascending';
         aDiv.appendChild(aAsc);
-        var sep = document.createTextNode(' / ');
-        aDiv.appendChild(sep);
-        //     link to "descending" followlines
-        var aDesc = document.createElement('a');
-        aDesc.setAttribute('href', url + '&descend=');
-        aDesc.textContent = 'descending';
-        aDiv.appendChild(aDesc);
+
+        if (!isHead) {
+            var sep = document.createTextNode(' / ');
+            aDiv.appendChild(sep);
+            //     link to "descending" followlines
+            var aDesc = document.createElement('a');
+            aDesc.setAttribute('href', url + '&descend=');
+            aDesc.textContent = 'descending';
+            aDiv.appendChild(aDesc);
+        }
 
         div.appendChild(aDiv);
 

--- a/tests/test-hgweb-commands.t	Mon Apr 24 18:33:23 2017 +0200
+++ b/tests/test-hgweb-commands.t	Mon Apr 24 10:32:15 2017 +0200
@@ -1343,7 +1343,7 @@
   <div class="overflow">
   <div class="sourcefirst linewraptoggle">line wrap: <a class="linewraplink" href="javascript:toggleLinewrap()">on</a></div>
   <div class="sourcefirst"> line source</div>
-  <pre class="sourcelines stripes4 wrap bottomline" data-logurl="/log/1/foo">
+  <pre class="sourcelines stripes4 wrap bottomline" data-logurl="/log/1/foo" data-ishead="0">
   <span id="l1">foo</span><a href="#l1"></a></pre>
   </div>
   
@@ -1471,7 +1471,7 @@
   <div class="overflow">
   <div class="sourcefirst linewraptoggle">line wrap: <a class="linewraplink" href="javascript:toggleLinewrap()">on</a></div>
   <div class="sourcefirst"> line source</div>
-  <pre class="sourcelines stripes4 wrap bottomline" data-logurl="/log/2/foo">
+  <pre class="sourcelines stripes4 wrap bottomline" data-logurl="/log/2/foo" data-ishead="1">
   <span id="l1">another</span><a href="#l1"></a></pre>
   </div>
   

--- a/tests/test-highlight.t	Mon Apr 24 18:33:23 2017 +0200
+++ b/tests/test-highlight.t	Mon Apr 24 10:32:15 2017 +0200
@@ -149,7 +149,7 @@
   <div class="overflow">
   <div class="sourcefirst linewraptoggle">line wrap: <a class="linewraplink" href="javascript:toggleLinewrap()">on</a></div>
   <div class="sourcefirst"> line source</div>
-  <pre class="sourcelines stripes4 wrap bottomline" data-logurl="/log/tip/primes.py">
+  <pre class="sourcelines stripes4 wrap bottomline" data-logurl="/log/tip/primes.py" data-ishead="1">
   <span id="l1"><span class="c">#!/usr/bin/env python</span></span><a href="#l1"></a>
   <span id="l2"></span><a href="#l2"></a>
   <span id="l3"><span class="sd">&quot;&quot;&quot;Fun with generators. Corresponding Haskell implementation:</span></span><a href="#l3"></a>