--- a/hgext3rd/evolve/obshistory.py	Wed Jan 10 19:47:43 2018 +0530
+++ b/hgext3rd/evolve/obshistory.py	Thu Jan 11 16:30:46 2018 +0530
@@ -189,7 +189,7 @@
         # Copied from patch.diff
         text = ''.join(sum((list(hlines) for hrange, hlines in hunks), []))
         patch = "\n".join(uheaders + [text])
-    return _indent(patch)
+    return patch
 
 class missingchangectx(object):
     ''' a minimal object mimicking changectx for change contexts
@@ -501,9 +501,19 @@
 
             # Description patch
             descriptionpatch = getmarkerdescriptionpatch(repo, node, succ)
+
             if descriptionpatch:
                 fm.plain("\n")
-                fm.plain(descriptionpatch)
+
+                def tolist(text):
+                    return [text]
+
+                for chunk, label in patch.difflabel(tolist, descriptionpatch):
+                    if chunk == '\t':
+                        continue
+                    if chunk != '\n':
+                        fm.plain('    ')
+                    fm.write('desc-diff', '%s', chunk, label=label)
 
             # Content patch
             diffopts = patch.diffallopts(repo.ui, {})

--- a/tests/test-evolve-obshistory.t	Wed Jan 10 19:47:43 2018 +0530
+++ b/tests/test-evolve-obshistory.t	Thu Jan 11 16:30:46 2018 +0530
@@ -77,13 +77,13 @@
   |
   x  [evolve.node|471f378eab4c] [evolve.rev|(1)] [evolve.short_description|A0]
        [evolve.verb|rewritten](description, content) as [evolve.node|4ae3a4151de9] by [evolve.user|test] [evolve.date|(Thu Jan 01 00:00:00 1970 +0000)]
-         --- a/471f378eab4c-changeset-description
-         +++ b/4ae3a4151de9-changeset-description
-         @@ -1,1 +1,3 @@
-         -A0
-         +A1
-         +
-         +Better commit message
+         [diff.deleted|--- a/471f378eab4c-changeset-description]
+         [diff.inserted|+++ b/4ae3a4151de9-changeset-description]
+         [diff.hunk|@@ -1,1 +1,3 @@]
+         [diff.deleted|-A0]
+         [diff.inserted|+A1]
+         [diff.inserted|+]
+         [diff.inserted|+Better commit message]
   
          [diff.diffline|diff -r 471f378eab4c -r 4ae3a4151de9 A0]
          [diff.file_a|--- a/A0	Thu Jan 01 00:00:00 1970 +0000]
@@ -98,14 +98,14 @@
   4ae3a4151de9 (2) A1
   471f378eab4c (1) A0
     rewritten(description, content) as 4ae3a4151de9 by test (Thu Jan 01 00:00:00 1970 +0000)
-      --- a/471f378eab4c-changeset-description	
-      +++ b/4ae3a4151de9-changeset-description	
+      --- a/471f378eab4c-changeset-description
+      +++ b/4ae3a4151de9-changeset-description
       @@ -1,1 +1,3 @@
       -A0
       +A1
       +
       +Better commit message
-  
+      
       diff -r 471f378eab4c -r 4ae3a4151de9 A0
       --- a/A0	Thu Jan 01 00:00:00 1970 +0000
       +++ b/A0	Thu Jan 01 00:00:00 1970 +0000