A proposed fix is in the inbox in Morphic-dtl.634.

Dave

On Wed, Jan 09, 2013 at 07:33:18PM -0500, Bob Arning wrote:
> Morph>>layoutBounds: and Morph>>doLayoutIn: share the job of 
> repositioning/sizing a morph, but only the latter invalidates changed 
> areas. Sample below:
> 
> showLayoutProblem
> "
> Morph showLayoutProblem
> "
>     | paneHeight row searchCount |
> 
>     row  _ AlignmentMorph newRow.
>     row addMorph: (StringMorph contents: 'hello').
> 
>     searchCount _ StringMorph new contents: '?'.
>     row addMorphBack: (
>         AlignmentMorph newColumn
>             layoutInset: 5;
>             color: Color tan;
>             listCentering: #center;
>             hResizing: #shrinkWrap;
>             addMorph: searchCount;
>             yourself
>     ).
> 
>     paneHeight _ StringMorph new contents: '?'.
>     row addMorphBack: (
>         AlignmentMorph newColumn
>             layoutInset: 5;
>             color: Color gray;
>             listCentering: #center;
>             hResizing: #shrinkWrap;
>             addMorph: paneHeight;
>             yourself
>     ).
> 
>     searchCount contents: 'ssss'.
>     paneHeight contents: 'pppp'.
>     Morph new
>         extent: 300 at 100;
>         color: Color white;
>         addMorph: row;
>         openInWorld.
>     [
>         (Delay forSeconds: 3) wait.
>         paneHeight contents: 'p'.
>     ] fork.
> 

>