Looking a bit further it seems that modal window probably are not the issue here

MorphicProject(Project)
enter: returningFlag revert: revertFlag saveForRevert: saveForRevert

....
	CurrentProject world triggerEvent: #aboutToLeaveWorld.
....


PasteUpMorph
triggerEvent: anEventSelector
	"Evaluate all actions registered for <anEventSelector>. Return the
value of the last registered action."

    ^(self actionForEvent: anEventSelector) value


anEventSelector is #aboutToLeaveWorld
and this is not implemented in PasteUpMorph.

We have an empty block and that causes #removeModalWindow in a way I
do not understand yet.

But if we would have

    #aboutToLeaveWorld

Then it we probably would not have this problem.

I wonder  #aboutToLeaveWorld  where this comes form, Squeak 3.9 and
Squeak 5.0 do not have it either.

--Hannes





On 10/9/17, Marcel Taeumel <marcel.taeumel at hpi.de> wrote:
> Hi Hannes,
>
> if you can manage to set-up the modal child (window), that removal should
> happen automatically. Use SystemWindow >> #modalLockTo:. Also see Morph >>
> #openModal:. For "control-flow-modality", instead, you should use a
> DialogWindow. See DialogWindow >> #getUserResponse.
>
> Best,
> Marcel
> Am 09.10.2017 11:53:04 schrieb H. Hirzel <hannes.hirzel at gmail.com>:
> Hello
>
> I start a separate thread for the issue brought up in the tread
>
> MorphicProject subclass: #EtoysProject
>
>
> To see it in action make sure
>
> EToys-hjh.308.mcz
>
> is loaded. It contains a fix for the menuTitleBorderColor which makes
> the following Etoys project load smoothly.
>
> Then drop the Etoys project file
>
> http://squeakland.org/content/articles/attach/FollowRoad.012.pr
>
> onto the desktop.
>
>
>
> When I choose 'World menu' -> 'Previous project', the following happens
>
>
>
>
> ----------------------------------
> Project class
> ----------------------------------
>
> returnToPreviousProject
> "Return to the project from which this project was entered. Do
> nothing if the current project has no link to its previous project."
>
> | prevProj |
> prevProj := CurrentProject previousProject.
> prevProj ifNotNil: [prevProj enter: true revert: false
> saveForRevert: false].
>
>
>
> ---------------------
> MorphicProject(Project)
>
> enter: returningFlag revert: revertFlag saveForRevert: saveForRevert
> "Install my ChangeSet, Transcript, and scheduled views as current
> globals. If returningFlag is true, we will return to the project from
> whence the current project was entered; don't change its
> previousProject link in this case.
> If saveForRevert is true, save the ImageSegment of the project
> being left.
> If revertFlag is true, make stubs for the world of the project
> being left.
> If revertWithoutAsking is true in the project being left, then
> always revert."
>
> ......
> CurrentProject world triggerEvent: #aboutToLeaveWorld.
> .....
>
>
> ----------------
>
> PasteUpMorph
> --------------------
>
> triggerEvent: anEventSelector
> "Evaluate all actions registered for . Return the
> value of the last registered action."
>
> ^(self actionForEvent: anEventSelector) value
>
>
> ------------------------
> PasteUpMorph
> ------------------------
>
>
> removeModalWindow
> self deprecated: 'The global becomeModal is no longer supported, use
> e.g. a dialog window'.
> "self modalWindow: nil"
>
>
>
> As mentioned in the thread
> MorphicProject subclass: #EtoysProject
> the issue may be "resolved" by just commenting out the deprecation message.
>
>
>
> removeModalWindow
>
> "self deprecated: 'The global becomeModal is no longer supported, use
> e.g. a dialog window'. "
>
> self flag: #fixMe.
>
> "self modalWindow: nil"
>
>
>
> Should we do this for the moment until is is more clear how the
> navigation mechanism in Etoys works?
>
> Other suggestions?
>
>
> Kind regards
>
> Hannes Hirzel
>
>
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