In 30456, I'm in the process of porting the Tiling Window Manager. I'm
experiencing this confusing error...

TWMDockingBarMorph DNU @

In DockingBarMorph>>updatePosition there is the following code:

self isAdheringToLeft
ifTrue: [| usedHeight usedWidth |
usedHeight := self usedHeightByPredominantDockingBarsOfChastes: #(#top ).
usedWidth := self usedWidthByPredominantDockingBarsOfChastes: #(#left ).
(usedHeight isNumber not or: [usedWidth isNumber]) ifFalse: [ Halt once ].
usedHeight := 1000.
usedWidth := 100.
self topLeft: self owner topLeft - margin + (usedWidth @ usedHeight)].

Pharo is saying that usedWidth = aTWMDockingBarMorph, even though it's set
to a number (for debugging) in the preceding statement. Any ideas?

Thanks.



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Cheers,
Sean
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