David T. Lewis wrote:
> Something is out of whack with MVC control scheduling in Squeak trunk.
> I am guessing that it may be something related to some earlier process
> scheduling changes, but I can't spot what is going wrong. Here are a couple
> of scenarios that illustrate the problem. Can anyone point me in the right
> direction to find the cause?

I think the problem comes from a debugger issue, specifically Debugger 
class>>openOn:context:label:contents:fullView: where it says:

	WorldState addDeferredUIMessage: [
		"..."
	].
	process suspend.

Since there is no drain for the deferred ui message and the process is 
suspended no debugger gets opened.

Cheers,
    - Andreas

> Scenario 1:
> 
>   From an MVC project, evaluate:
> 
>     ProjectView open: MVCProject new.
> 
>   No window opens, and the image will not respond.
> 
>   Now do an <alt><period>, and Squeak exits with "scheduler could not
>   find a runnable process" on the console.
> 
> Scenario 2:
> 
>   In an MVC project, do <alt><period>. No debugger window opens. Do
>   another <alt><period>, and Squeak exits with "scheduler could not
>   find a runnable process" on the console.
> 
> I first noticed this issue some time ago when I was checking low
> space interrupt handling (which is broken for the same reason I guess).
> Today I was looking at a problem in the MVC open->mvc project menu
> and see the same sort of symptoms, so I think this is an issue that
> has been in trunk for a while, most likely prior to any of the recent
> Project refactorings to separate MVC and Morphic.
> 
> Thanks,
> Dave
> 
> 
>