[Editor] Fix crash when editing TileMap

[AThousandShips]

Crash caused by deferred calls to redraw, combined with objects being freed

• Fixes: TileMapEditor crashes sometimes when switching scene tabs #90827

[AThousandShips]

Marking as draft for the moment and will change the general code to use Ref instead of pointers for general safety

Will do this broader change as a separate future PR if desired, just keeping this one simple for now

[groud]

Will do this broader change as a separate future PR if desired, just keeping this one simple for now

Using a Ref<> would be simpler and better IMO. The approach using ObjectID is mainly useful for nodes, which cannot be ref-counted if I am not mistaking. In general using Ref is safer too.

If you don't want to put more work in this right now though, I don't mind merging the PR in the current state. It's good enough to fix the crash.

[AThousandShips]

I'll swap out these specific cases to Ref and do wider changes in a subsequent PR, but the change to ref for these is trivial, will do later today

[akien-mga]

Thanks!

[AThousandShips]

Thank you!