Dead code regarding drag and drop

[tinchodias]

We have these classes, only "cancel" is referenced:

they are the only sends of these spaceDraw* selectors, and the methods have "red" (undefined) methods:

@rvillemeur and @Enzo-Demeulenaere do you know about this? do we remove this code?

[rvillemeur]

@tinchodias, these event are used in the GToolkit version of Drag&Drop, where dragged element are managed at the space level. They may be removed in the future, once we clarify exactly which way we want to handle drag&drop in Pharo. Stay with low level space, or provide higher level API like GToolkit, or a mix between both. There are no clear answers for now.

[tinchodias]

Let's close this issue. I recently merged a PR from Enzo regarding this topic, and I see it's on development.