Index: src/blob.c
==================================================================
--- src/blob.c
+++ src/blob.c
@@ -927,10 +927,29 @@
 }
 void blobarray_reset(Blob *aBlob, int n){
   int i;
   for(i=0; i<n; i++) blob_reset(&aBlob[i]);
 }
+/*
+** Allocate array of n blobs and initialize each element with `empty_blob`
+*/
+Blob* blobarray_new(int n){
+  int i;
+  Blob *aBlob = fossil_malloc(sizeof(Blob)*n);
+  for(i=0; i<n; i++) aBlob[i] = empty_blob;
+  return aBlob;
+}
+/*
+** Free array of n blobs some of which may be empty (have NULL buffer)
+*/
+void blobarray_delete(Blob *aBlob, int n){
+  int i;
+  for(i=0; i<n; i++){
+    if( blob_buffer(aBlob+i) ) blob_reset(aBlob+i);
+  }
+  fossil_free(aBlob);
+}
 
 /*
 ** Parse a blob into space-separated tokens.  Store each token in
 ** an element of the blobarray aToken[].  aToken[] is nToken elements in
 ** size.  Return the number of tokens seen.

Index: src/default.css
==================================================================
--- src/default.css
+++ src/default.css
@@ -703,11 +703,14 @@
 td.difftxt ins > ins.edit {
   background-color: #c0c0ff;
   text-decoration: none;
   font-weight: bold;
 }
-
+body.tkt div.content li > table.udiff {
+  margin-left: 1.5em;
+  margin-top: 0.5em;
+}
 
 span.modpending {
   color: #b03800;
   font-style: italic;
 }

Index: src/info.c
==================================================================
--- src/info.c
+++ src/info.c
@@ -2828,11 +2828,11 @@
     @ </blockquote>
   }
 
   @ <div class="section">Changes</div>
   @ <p>
-  ticket_output_change_artifact(pTktChng, 0, 1);
+  ticket_output_change_artifact(pTktChng, 0, 1, 0);
   manifest_destroy(pTktChng);
   style_finish_page();
 }
 
 

Index: src/tkt.c
==================================================================
--- src/tkt.c
+++ src/tkt.c
@@ -1204,10 +1204,11 @@
   Stmt q;
   char *zTitle;
   const char *zUuid;
   int tagid;
   int nChng = 0;
+  Blob *aLastVal = 0;
 
   login_check_credentials();
   if( !g.perm.Hyperlink || !g.perm.RdTkt ){
     login_needed(g.anon.Hyperlink && g.anon.RdTkt);
     return;
@@ -1233,10 +1234,14 @@
   }
   if( P("raw")!=0 ){
     @ <h2>Raw Artifacts Associated With Ticket %h(zUuid)</h2>
   }else{
     @ <h2>Artifacts Associated With Ticket %h(zUuid)</h2>
+    getAllTicketFields();
+    if( nTicketBslns ){
+      aLastVal = blobarray_new(nField);
+    }
   }
   db_prepare(&q,
     "SELECT datetime(mtime,toLocal()), objid, uuid, NULL, NULL, NULL"
     "  FROM event, blob"
     " WHERE objid IN (SELECT rid FROM tagxref WHERE tagid=%d)"
@@ -1289,11 +1294,11 @@
           @ <blockquote><pre>
           @ %h(blob_str(&c))
           @ </pre></blockquote>
           blob_reset(&c);
         }else{
-          ticket_output_change_artifact(pTicket, "a", nChng);
+          ticket_output_change_artifact(pTicket, "a", nChng, aLastVal);
         }
       }
       manifest_destroy(pTicket);
     }
     @ </li>
@@ -1301,10 +1306,11 @@
   db_finalize(&q);
   if( nChng ){
     @ </ol>
   }
   style_finish_page();
+  if( aLastVal ) blobarray_delete(aLastVal, nField);
 }
 
 /*
 ** Return TRUE if the given BLOB contains a newline character.
 */
@@ -1322,44 +1328,85 @@
 ** description of this object.
 */
 void ticket_output_change_artifact(
   Manifest *pTkt,           /* Parsed artifact for the ticket change */
   const char *zListType,    /* Which type of list */
-  int n                     /* Which ticket change is this */
+  int n,                    /* Which ticket change is this */
+  Blob *aLastVal            /* Array of latest values for the diffs */
 ){
   int i;
   if( zListType==0 ) zListType = "1";
   getAllTicketFields();
   @ <ol type="%s(zListType)">
   for(i=0; i<pTkt->nField; i++){
-    Blob val;
-    const char *z, *zX;
-    int id;
-    z = pTkt->aField[i].zName;
-    blob_set(&val, pTkt->aField[i].zValue);
-    zX = z[0]=='+' ? z+1 : z;
-    id = fieldId(zX);
+    const char *z  = pTkt->aField[i].zName;
+    const char *zX = z[0]=='+' ? z+1 : z;
+    const int id = fieldId(zX);
+    const char  *zValue = pTkt->aField[i].zValue;
+    const size_t nValue = strlen(zValue);
+    const int bLong = nValue>50 || memchr(zValue,'\n',nValue)!=NULL;
+    const int bCanDiff = aLastVal && id>=0 && aField[id].zBsln;
+    int bAppend = 0, bRegular = 0;
     @ <li>\
     if( id<0 ){
       @ Untracked field %h(zX):
     }else if( aField[id].mUsed==USEDBY_TICKETCHNG ){
       @ %h(zX):
     }else if( n==0 ){
       @ %h(zX) initialized to:
     }else if( z[0]=='+' && (aField[id].mUsed&USEDBY_TICKET)!=0 ){
       @ Appended to %h(zX):
-    }else{
-      @ %h(zX) changed to:
-    }
-    if( blob_size(&val)>50 || contains_newline(&val) ){
-      @ <blockquote><pre class='verbatim'>
-      @ %h(blob_str(&val))
-      @ </pre></blockquote></li>
-    }else{
-      @ "%h(blob_str(&val))"</li>
-    }
-    blob_reset(&val);
+      bAppend = 1;
+    }else{
+      if( !bCanDiff ){
+        @ %h(zX) changed to: \
+      }
+      bRegular = 1;
+    }
+    if( bCanDiff ){
+      Blob *prev = aLastVal+id;
+      Blob val = BLOB_INITIALIZER;
+      if( nValue ){
+        blob_init(&val, zValue, nValue+1);
+        val.nUsed--;  /* makes blob_str() faster */
+      }
+      if( bRegular && nValue && blob_buffer(prev) && blob_size(prev) ){
+        Blob d = BLOB_INITIALIZER;
+        DiffConfig DCfg;
+        construct_diff_flags(1, &DCfg);
+        DCfg.diffFlags |= DIFF_HTML | DIFF_LINENO;
+        text_diff(prev, &val, &d, &DCfg);
+        @ %h(zX) changed as:
+        @ %s(blob_str(&d))
+        @ </li>
+        blob_reset(&d);
+      }else{
+        if( bRegular ){
+          @ %h(zX) changed to:
+        }
+        if( bLong ){
+          @ <blockquote><pre class='verbatim'>
+          @ %h(zValue)
+          @ </pre></blockquote></li>
+        }else{
+          @ "%h(zValue)"</li>
+        }
+      }
+      if( blob_buffer(prev) && blob_size(prev) && !bAppend ){
+        blob_truncate(prev,0);
+      }
+      if( nValue ) blob_appendb(prev, &val);
+      blob_reset(&val);
+    }else{
+      if( bLong ){
+        @ <blockquote><pre class='verbatim'>
+        @ %h(zValue)
+        @ </pre></blockquote></li>
+      }else{
+        @ "%h(zValue)"</li>
+      }
+    }
   }
   @ </ol>
 }
 
 /*