[FIX] FileListDnDFix-asm ( [et][er] can we do better than #isKindOf:? )

[ned at squeakland.org]

This looks OK, but I'm not sure how it'll play with other changes to
lists (like LargeLists, etc.).

Perhaps it would be better if we said something like:

isDirectoryList: aMorph
	^[ aMorph getListSelector == #volumeList ]
		on: MessageNotUnderstood
		do: [ :ex | ex return: false ]













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