diff -r 243b06d0e230 -r 03c4a3e4ddd2 UIHelpTool.st
--- a/UIHelpTool.st	Sun Sep 26 16:14:08 1999 +0200
+++ b/UIHelpTool.st	Mon Sep 27 13:48:04 1999 +0200
@@ -974,43 +974,48 @@
 listSelection:aSelection
     "sets current selection"
 
-    |txt view sel|
-
-    aSelection isNil 
-        ifTrue: [(builder componentAt: #listOfHelpKeysView) selection: nil]
-        ifFalse: [(dictionary includesKey: aSelection asSymbol) ifFalse: [self findHelpSpecForKey: aSelection]].
+    |txt view selection|
 
-    aSelection isNumber ifTrue:[
-        aSelection ~~ 0 ifTrue:[
-            sel := self listChannel value at:aSelection
-        ]
-    ] ifFalse:[
-        aSelection size ~~ 0 ifTrue:[
-            sel := aSelection withoutSeparators.
-            sel size == 0 ifTrue:[
-                sel := nil
+    aSelection notNil ifTrue:[
+        aSelection isNumber ifTrue:[
+            aSelection ~~ 0 ifTrue:[
+                selection := self listChannel value at:aSelection ifAbsent:nil
+            ]
+        ] ifFalse:[
+            selection := aSelection withoutSeparators.
+
+            selection size == 0 ifTrue:[
+                selection := nil
             ]
         ]
     ].
 
-    listSelection = sel ifFalse:[
-        listSelection := sel.
-
-        modifiedHolder notNil ifTrue:[
-            modifiedHolder value:true.
-        ].
+    selection isNil ifTrue:[
+        (builder componentAt:#listOfHelpKeysView) selection:nil
+    ] ifFalse:[
+        (dictionary includesKey:selection asSymbol) ifFalse:[
+            self findHelpSpecForKey:selection
+        ]
+    ].
+    listSelection == selection ifTrue:[
+        ^ self
+    ].
+    listSelection := selection.
 
-        (view := self editTextView) notNil ifTrue:[
-            listSelection notNil ifTrue:[
-                txt := dictionary at:(listSelection asSymbol) ifAbsent:nil.
+    modifiedHolder notNil ifTrue:[
+        modifiedHolder value:true.
+    ].
 
-                (txt isNil or:[maxCharsPerLine isNil]) ifFalse:[
-                    txt := UIPainter convertString:(txt asString) maxLineSize:maxCharsPerLine skipLineFeed:false.
-                ]
-            ]. 
-            view contents:txt.
-            view modified:false.
-        ]
+    (view := self editTextView) notNil ifTrue:[
+        listSelection notNil ifTrue:[
+            txt := dictionary at:(listSelection asSymbol) ifAbsent:nil.
+
+            (txt isNil or:[maxCharsPerLine isNil]) ifFalse:[
+                txt := UIPainter convertString:(txt asString) maxLineSize:maxCharsPerLine skipLineFeed:false.
+            ]
+        ]. 
+        view contents:txt.
+        view modified:false.
     ]
 
 ! !