Sprite destroy on wall does not work with edge of screen

[kevinjwalters]

Describe the bug
The setting for sprites for destroy on wall does not trigger destruction when a sprite goes of screen on a tilemap-less screen. bounce on wall does bounce on the edge of the screen suggesting an implicit wall. This is inconsistent.

I've seen this in beta beta, 0.14.45 / 5.30.6, but I think it's like this in all versions.

If you run the code in #1505 the cyan duck at the bottom will eventually come back on screen very briefly. This is not shown in the short animated gifs as they don't cover enough time.

To Reproduce
Steps to reproduce the behavior:

1. Set a sprite to destroy on wall
2. Set velocity or acceleration to set it moving
3. Watch it go off screen.
4. Set reverse direction to make it come back.
5. Observe it re-appearing.

Expected behavior
I'd expect consistent behaviour between bounce on wall and destroy on wall here.

Screenshots

Desktop (please complete the following information):

• n/a

Smartphone (please complete the following information):

• n/a

Additional context
Discussed in #1505 (comment)

[kevinjwalters]

I've just noted the adding camera follow sprite to a moving sprite prevents it from hitting the implicit wall 😞

[riknoll]

@kevinjwalters if you add a camera follow to a sprite, it will never hit the edge of the screen because the screen moves with it.