Issue 6039 in pharo: The PolygonMorph raise SubscriptOutOfBounds due deletion of the last point

Status: New
Owner: ----
Labels: Milestone-1.4 Type-Bug

New issue 6039 by [hidden email]: The PolygonMorph raise  
SubscriptOutOfBounds due deletion of the last point
http://code.google.com/p/pharo/issues/detail?id=6039

After current changes in the Morph class, handleMouseUp: method has this  
call at the last line:
"self eventHandler ifNotNil: [:handler | handler mouseUp: anEvent  
fromMorph: self ]"
So if a morph use "on: ..." mechanics like the PolygonMorph does, this line  
always fire a class EventHandler.

For the bad luck, just before, it is the call: "self mouseUp: anEvent.".

And the default mouseUp: method of the Morph class, also contain the same  
EventHandler call.

So the "on:.." method called twice, and the PolygonMorph is trying to  
delete already deleted vertex.

I am not the big specialist in the morphic event system, so cant propose  
the right changes. Nevertheless something should be done with this. :)




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Comment #1 on issue 6039 by [hidden email]: The PolygonMorph raise  
SubscriptOutOfBounds due deletion of the last point
http://code.google.com/p/pharo/issues/detail?id=6039

Can you have a snippet of code showing the problem because so far I'm lost.




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Comment #2 on issue 6039 by [hidden email]: The PolygonMorph raise  
SubscriptOutOfBounds due deletion of the last point
http://code.google.com/p/pharo/issues/detail?id=6039

Here it is.
The fresh today oneclick installation. In the workspace executed:

PolygonMorph new makeOpen; beStraightSegments; position: 10@10;  
toggleHandles; openInWorld

Just drop the topmost circle on the next one to delete a vertex, and  
get "Subscript out of bounds"



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