On Wed, 10 May 2017 08:13:45 0000, commits at source.squeak.org
<commits at source.squeak.org> wrote:
> Marcel Taeumel uploaded a new version of Morphic to project The Trunk:
> http://source.squeak.org/trunk/Morphic-mt.1336.mcz
>
> ==================== Summary ====================
>
> Name: Morphic-mt.1336
> Author: mt
> Time: 10 May 2017, 10:13:26.142647 am
> UUID: 4d60356c-2429-724c-9d45-4fe22cd330fc
> Ancestors: Morphic-ul.1335
>
> Quick fix to avoid accidential drops of system windows into the world main
> docking bar.
+1

> Actually, we should think about the necessity of having the preference
> #systemWindowEmbedOK, which is set to "true" in current images. Setting that
> preference to "false" would have also solved the issue but committing state
> (other than code) via Monticello is cumbersome.

There should probably more options governing the embedding of SystemWindows.
See thread 'Preferences systemWindowEmbedOK'

>
> I think that that preference origins from the time when we could manage
> worlds in worlds and also MVC windows having Morphic worlds. Much of that
> code was removed in the course of clean-up since MVC and Morphic are quite
> different in their basic event processing and drawing methods.
>
> =============== Diff against Morphic-ul.1335 ===============
>
> Item was changed:
>   ----- Method: SystemWindow>>wantsToBeDroppedInto: (in category 'events')
> -----
>   wantsToBeDroppedInto: aMorph
>   	"Return true if it's okay to drop the receiver into aMorph"
> + 	^ (aMorph isWorldMorph or:[Preferences systemWindowEmbedOK])
> + 		and: [aMorph isDockingBar not]!
> - 	^aMorph isWorldMorph or:[Preferences systemWindowEmbedOK]!
>
>
>