On my 

Pharo4.0
Latest update: #40609

Pressing Alt-Tab brings up a debugger. Debugging the method shows:

newPreviewMorph
        "Answer a new preview holder."
        self halt.
        ^ Morph new
                color: Color transparent;
                extent: self defaultPreviewExtent;
                yourself.


On 16 May 2015, at 1:09 AM, Avdi Grimm <a...@avdi.org> wrote:



On Fri, May 15, 2015 at 7:06 PM Carlo <snoob...@gmail.com 
<mailto:snoob...@gmail.com>> wrote:
Removing the 'self halt' still works though.

Can you give me a little more detail about where to find this? Thanks! 

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