[2.0.16] preserving display panel configuration when upgrading/replacing with fast_replaceable_group ~= nil

[Quezler]

When you have different tiers of display panels of the same size (like https://mods.factorio.com/mod/sign-post 2.0.0) and try to switch between them the configuration gets lost, i'm currently implementing my own bootleg version in lua that would handle most but not all cases, would be nice if this was supported on the c++ side.

[curiosity]

This seems like it belongs in bugs.

[Quezler]

I suppose a moderator could move it then