This may help Eliot in his case this time, but there are other places
which could just as easily trap a reference to a user's "domain"
object just as inconspicuously.

Like the World 'stepList' or the WorldState's 'commandHistory'.

Maybe we need some kind of registration/release mechanism..??

On Tue, May 10, 2016 at 4:45 PM,  <commits at source.squeak.org> wrote:
> Balázs Kósi uploaded a new version of Morphic to project The Trunk:
> http://source.squeak.org/trunk/Morphic-kb.1143.mcz
>
> ==================== Summary ====================
>
> Name: Morphic-kb.1143
> Author: kb
> Time: 10 May 2016, 11:45:07.978281 pm
> UUID: 8e7819ed-0a1d-4a4d-9c6b-23ce3272097c
> Ancestors: Morphic-mt.1142
>
> Fix DockingBarMorph keeping unnecessary references to oldMouseFocus and oldKeyboardFocus by clearing them when deactivating.
>
> =============== Diff against Morphic-mt.1142 ===============
>
> Item was changed:
>   ----- Method: DockingBarMorph>>deactivate: (in category 'events') -----
>   deactivate: evt
>
> +       | newKeyboardFocus newMouseFocus |
>         self selectItem: nil event: evt.
> +       newKeyboardFocus := self oldKeyboardFocus.
> +       newMouseFocus := self oldMouseFocus.
> +       oldKeyboardFocus := oldMouseFocus := nil.
>         evt hand
> +               newKeyboardFocus: newKeyboardFocus;
> +               newMouseFocus: newMouseFocus!
> -               newKeyboardFocus: self oldKeyboardFocus;
> -               newMouseFocus: self oldMouseFocus!
>
>