--- a/Tools__ViewTreeApplication.st	Wed Feb 08 01:02:22 2017 +0100
+++ b/Tools__ViewTreeApplication.st	Sun Feb 12 11:54:51 2017 +0100
@@ -4071,42 +4071,52 @@
 do:aOneArgBlock
     "evaluate the argument, aBlock for each item in the selection
     "
-    |cashedSelection|
-
-    cashedSelection := selection.
-    cashedSelection isNil ifTrue:[^ nil].
-  ^ cashedSelection do:aOneArgBlock
+    |keptSelection|
+
+    "/ the selection may change at any time (may it?)
+    (keptSelection := selection) isNil ifTrue:[^ nil].
+    ^ keptSelection do:aOneArgBlock
+
+    "Modified (format): / 12-02-2017 / 11:53:23 / cg"
 !
 
 from:start do:aOneArgBlock
     "evaluate the argument, aBlock for the items starting at index start
     "
-    |cashedSelection|
-
-    cashedSelection := selection.
-    cashedSelection isNil ifTrue:[^ nil].
-  ^ cashedSelection from:start do:aOneArgBlock
+    |keptSelection|
+
+    "/ the selection may change at any time (may it?)
+    (keptSelection := selection) isNil ifTrue:[^ nil].
+    "/ but if so, then start may no longer be valid here??
+    ^ keptSelection from:start do:aOneArgBlock
+
+    "Modified (comment): / 12-02-2017 / 11:52:57 / cg"
 !
 
 from:start to:stop do:aOneArgBlock
     "evaluate the argument, aBlock for the items with index start to
      stop in the selection.
     "
-    |cashedSelection|
-
-    cashedSelection := selection.
-    cashedSelection isNil ifTrue:[^ nil].
-  ^ cashedSelection from:start to:stop do:aOneArgBlock
+    |keptSelection|
+
+    "/ the selection may change at any time (may it?)
+    (keptSelection := selection) isNil ifTrue:[^ nil].
+    "/ but if so, then start and stop may no longer be valid here??
+    ^ keptSelection from:start to:stop do:aOneArgBlock
+
+    "Modified (comment): / 12-02-2017 / 11:52:25 / cg"
 !
 
 reverseDo:aOneArgBlock
     "evaluate the argument, aBlock for each item in the selection
     "
-    |cashedSelection|
-
-    cashedSelection := selection.
-    cashedSelection isNil ifTrue:[^ nil].
-  ^ cashedSelection reverseDo:aOneArgBlock
+    |keptSelection|
+
+    "/ the selection may change at any time (may it?)
+    (keptSelection := selection) isNil ifTrue:[^ nil].
+    ^ keptSelection reverseDo:aOneArgBlock
+
+    "Modified: / 12-02-2017 / 11:50:02 / cg"
 !
 
 select:aBlock
@@ -4259,11 +4269,13 @@
      If none of the evaluations returns true, the result of the evaluation
      of the exceptionBlock is returned
     "
-    |cashedSelection|
-
-    cashedSelection := selection.
-    cashedSelection isNil ifTrue:[ ^ exceptionBlock value ].
-  ^ cashedSelection detect:aBlock ifNone:exceptionBlock
+    |keptSelection|
+
+    "/ the selection may change at any time (may it?)
+    (keptSelection := selection) isNil ifTrue:[ ^ exceptionBlock value ].
+    ^ keptSelection detect:aBlock ifNone:exceptionBlock
+
+    "Modified (format): / 12-02-2017 / 11:54:13 / cg"
 !
 
 detectLast:aBlock
@@ -4282,11 +4294,13 @@
      If none of the evaluations returns true, the result of the evaluation
      of the exceptionBlock is returned
     "
-    |cashedSelection|
-
-    cashedSelection := selection.
-    cashedSelection isNil ifTrue:[ ^ exceptionBlock value ].
-  ^ cashedSelection detectLast:aBlock ifNone:exceptionBlock
+    |keptSelection|
+
+    "/ the selection may change at any time (may it?)
+    (keptSelection := selection) isNil ifTrue:[ ^ exceptionBlock value ].
+    ^ keptSelection detectLast:aBlock ifNone:exceptionBlock
+
+    "Modified (format): / 12-02-2017 / 11:53:49 / cg"
 ! !
 
 !ViewTreeInspectorApplication::ViewTreeModel methodsFor:'selection testing'!
@@ -4294,44 +4308,45 @@
 includes:anItem
     "returns true if the item is in the current selection
     "
-    |cashedSelection|
-
-    cashedSelection := selection.
-    cashedSelection isNil ifTrue:[^ false].
- ^  cashedSelection includesIdentical:anItem
+    |keptSelection|
+
+    "/ the selection may change at any time (may it?)
+    (keptSelection := selection) isNil ifTrue:[^ false].
+    ^ keptSelection includesIdentical:anItem
+
+    "Modified: / 12-02-2017 / 11:51:34 / cg"
 !
 
 includesAll:aCollection
     "return true, if all items of the collection are included in the current selection
     "
-    |cashedSelection|
+    |keptSelection|
 
     aCollection size ~~ 0 ifTrue:[
-        cashedSelection := selection.
-        cashedSelection isNil ifTrue:[ ^ false ].
-
-        aCollection do:[:el|
-            (cashedSelection includesIdentical:el) ifFalse:[^ false]
-        ]
+        "/ the selection may change at any time (may it?)
+        (keptSelection := selection) isNil ifTrue:[ ^ false ].
+
+        ^ aCollection contains:[:el| (keptSelection includesIdentical:el)]
     ].
     ^ true
+
+    "Modified (format): / 12-02-2017 / 11:51:14 / cg"
 !
 
 includesAny:aCollection
-    "return true, if the any item of the collection is in the current selection
+    "return true, if any item of the collection is in the current selection
     "
-    |cashedSelection|
+    |keptSelection|
 
     aCollection notNil ifTrue:[
-        cashedSelection := selection.
-
-        cashedSelection notNil ifTrue:[
-            aCollection do:[:el|
-                (cashedSelection includesIdentical:el) ifTrue:[^ true]
-            ]
+        "/ the selection may change at any time (may it?)
+        (keptSelection := selection) notNil ifTrue:[
+            ^ aCollection contains:[:el| (keptSelection includesIdentical:el)]
         ]
     ].
     ^ false
+
+    "Modified (format): / 12-02-2017 / 11:50:26 / cg"
 !
 
 includesIdentical:anItem