Ghost window impossible to close (Window SDL2 backend)

[labordep]

Related to #461, below this is a case with a ghost window.
When the test is done, this is not possible to close the window.

Add this method in a TestCase subclass:

testSpaceWindowCannotBeClosedManually

	"open the view"
	| blElement space |
	blElement := BlElement new.
	blElement background: Color cyan.
	
	blElement constraintsDo: [ :c |
		c vertical matchParent.
		c horizontal matchParent ].
	space := blElement openInSpace.
	space title: 'Test'.
	
	5 asSeconds wait.

Config:

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

[tinchodias]

I didn't reproduce: this is only a normal opened space. Maybe your TestCase has some setUp or tearDown that I should add.

I will try to do it on my side.

[labordep]

Can you run it twice?