--- a/DiffTextView.st	Fri Jan 24 18:06:39 2014 +0100
+++ b/DiffTextView.st	Sun Jan 26 14:54:14 2014 +0100
@@ -339,8 +339,6 @@
                 nr2 := text2 size + 1.
                 state := #finish.
             ] ifFalse:[
-                diffLineNumbers add:l1 size.
-
                 s := ReadStream on:entry.
                 nr1 := Integer readFrom:s.
                 s peek == $, ifTrue:[
@@ -355,6 +353,7 @@
                 ] ifFalse:[
                     nr3 := nil
                 ].
+                diffLineNumbers add:{ op . nr1 . nr2 }.
 
                 op == $c ifTrue:[
                     state := #changed.
@@ -400,7 +399,6 @@
                 idx2 := idx2 + 1.
             ].
 
-
             "
              add a separating line, except at end
             "
@@ -409,10 +407,9 @@
                     showSeparators ifTrue:[
                         l1 add:'--------'.
                         l2 add:'--------'.
-                    ]
+                    ].
                 ]
             ].
-
         ] ifFalse:[
             state == #changed ifTrue:[
                 line1 := line2 := nil.
@@ -525,7 +522,7 @@
                     ] 
                     "must be in finish otherwise"
                 ]
-            ]
+            ].
         ].
         dIdx := dIdx + 1
     ].
@@ -578,15 +575,55 @@
 
     textView1 list:lists first.
     textView2 list:lists second.
+
+    self updateScrollbarBackground
+!
+
+updateScrollbarBackground
+    "define a background in the scroller allowing quick positioning to changes"
+
+    |container vScroller thumb|
+
+    (container := self container) isScrollWrapper ifTrue:[
+        (vScroller := container verticalScrollBar) notNil ifTrue:[
+            (thumb := vScroller thumb) notNil ifTrue:[
+                thumb 
+                    backgroundDrawHook:[:x :y :w :h |
+                        |overAllHeight|
+
+                        overAllHeight := textViews first numberOfLines.
+                        1 to:overAllHeight do:[:lineNr |
+                            |l1 l2 isDiff yThumb clr e|
+
+                            l1 := textViews first listAt:lineNr.
+                            l2 := textViews second listAt:lineNr.
+                            (l1 notNil and:[l1 isText]) ifTrue:[
+                                e := l1 emphasis
+                            ] ifFalse:[
+                                (l2 notNil and:[l2 isText ]) ifTrue:[
+                                    e := l2 emphasis
+                                ]
+                            ].
+                            e size > 0 ifTrue:[
+                                clr := Text extractEmphasis:#backgroundColor from:(e at:1).
+                                thumb paint:clr.
+                                yThumb := (thumb height * (lineNr / overAllHeight)) rounded.
+                                thumb displayLineFromX:1 y:yThumb toX:thumb width-2 y:yThumb.
+                            ].
+                        ]
+                    ]
+            ]
+        ]
+    ].
 ! !
 
 !DiffTextView class methodsFor:'documentation'!
 
 version
-    ^ '$Header: /cvs/stx/stx/libtool/DiffTextView.st,v 1.58 2013-03-11 11:51:45 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libtool/DiffTextView.st,v 1.59 2014-01-26 13:54:14 cg Exp $'
 !
 
 version_CVS
-    ^ '$Header: /cvs/stx/stx/libtool/DiffTextView.st,v 1.58 2013-03-11 11:51:45 cg Exp $'
+    ^ '$Header: /cvs/stx/stx/libtool/DiffTextView.st,v 1.59 2014-01-26 13:54:14 cg Exp $'
 ! !