Well, I must admit my understanding of layouts is a bit weak.
I do get the basics, but ...
So I did simple editors for LayoutMorphs and LayoutSpecs.
You need the latest Morphic-Panels.pck.st and Morphic-ColorEditor.pck.st from Cuis-Smalltalk-BabySteps.
Load the Morphic-Panels.pck.st (it Requires the other package).
Now left-click to select any Morph, use its menu to edit its LayoutSpec.
Left-click on a LayoutMorph to select and use the menu to "Edit me", i.e. the LayoutSpec.
Simple editors, but shows a bit of what is going on.
Not bullet proof, but usable. Bugs to me..
Cheers,
-KenD
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-KenD