I think this problem could lead to debugger issues with stepOver and stepThrough. For example:

Context>>#stepToHome:

�� �� ��...

�� �� ��context := aContext insertSender: (Context
�� �� �� �� �� contextOn: UnhandledError do: [:ex | ... ])

It is a method which is used for stepThrough. If current method has outer handler for Error then the UnhandledError logic will be ignored.

Step over is based on following method:

Context>>runUntilErrorOrReturnFrom: aSender

�� �� �� �� �� ��...

context := aSender insertSender: (Context

contextOn: Error do: [:ex |

�� ��error ifNil: [

�� ��"this is ugly but it fixes the side-effects of not sending an Unhandled error on Halt"

�� ��error := (ex isKindOf: UnhandledError) ifTrue: [ ex exception ] ifFalse: [ ex ].

...

I think UnhandledError branch will never be true:

[ 1/0 ] on: Error do: [:e | e logCr. e3 pass ]

Handler here is executed only once with ZeroDivide error.��