Ghost windows are not closing + system cleanup feature

[labordep]

Hi,

Related to #457, we have always ghost windows that are not closing correctly (SDL2).
This is not easy to reproduce at each time, I think we need to use a clean safety code.
Do you have the code below in a Bloc "system cleanup" feature ?

BlOSWindowSDL2Host universe closeSpaces.
BlOSWindowSDL2Host
	stop;
	start.
BlMorphicWindowHost universe closeSpaces.
BlMorphicWindowHost
	stop;
	start 

This code, extracted from Toplo, is very useful for cleaning up ghost windows. If it exists, could we integrate this code when cleaning up the image via the system menu?

Thanks :)

Config:

• Windows 10 Pro
• Pharo-11.0.0+build.725
• VM 10.1.0.0

[tinchodias]

In addition, this is a script I used once to force destroying SDL windows:

"Destroy all SDL windows except the Pharo IDE (assuming its title ends with '.image')"
SDL_Window allInstances
	reject: [ :each | each isNull or: [ each title endsWith: '.image' ] ]
	thenDo: [ :each | each hide; destroy ]

[labordep]

After executing twice the test on #463 I have my ghost window.
After, I execute this code:

BlOSWindowSDL2Host universe closeSpaces.
BlOSWindowSDL2Host
	stop;
	start.
BlMorphicWindowHost universe closeSpaces.
BlMorphicWindowHost
	stop;
	start 

And after a Do Image Cleanup I got this error:

[labordep]

@tinchodias I wrote a branch here #464

[tinchodias]

The PRs are merged so I guess we can close this issue