Specific platform ignoring

[arthuro555]

See #1339
Let a specific instance of a Platformer behavior ignore a specific instance of a Platform Behavior.

Only has a JS implementation.

I am not sure about the declaration of the extension, and on my current setup I cannot compile GDevelop.js so I cannot test the modifications. They seem to compile fine on circle ci though.

[4ian]

For now I'm not entirely convinced we need to add this extra complexity in the code. :/
This forces us to use IDs, which is almost an anti-pattern that I reluctantly added to objects but that I would like to avoid as much as possible (risks of overflow, risk of IDs reused, if you delete a platform you still have its ID polluting the "ignored platform" array of all the behaviors that used to ignore it, if you create a new platform and for some reason reuse an ID, you now have a bug, etc...).

It's also partially solvable by disabling the behavior - though I agree it's not giving the exact same result because other platformer characters are also implied.

What do you think?

[arthuro555]

I do think IDs are not the best way to do it but I don't see any other way of achieving this. But I also think this is important for multiplayer games. I think it's the most optimized way, even if it is not very optimal. Do you have any other ideas on how to implement it?

[4ian]

Not really, but it's the goal of this PR to be finding the best solution :) As I said previously, IDs have all the risks that I wrote and I don't think they are addressed.

I don't have a better idea - but we'll always prefer to not have a feature rather than having one that is creating risks/potential bugs/hard to debug behaviors :/

[arthuro555]

well, I'm closing this because there are too much potential unsolvable problems.