Allow JS state (this) inside DivElement

[fonsp]

cc @ghaetinger

[github-actions]

Try this Pull Request!

Open Julia and type:

julia> import Pkg
julia> Pkg.activate(temp=true)
julia> Pkg.add(url="https://github.com/fonsp/Pluto.jl", rev="persist_js_state-inside-DivElement")
julia> using Pluto

[dralletje]

Smart!

[fonsp]

Maybe we should solve script ID before merging this..

[ghaetinger]

I've just tested this out using D3, which requires this to be persisted on updates. Here's how it works:

Using this PR:

line.jl.Pluto.jl.and.9.more.pages.-.Personal.-.Microsoft.Edge.2022-03-30.11-56-54.mp4

Without this PR:

line.jl.Pluto.jl.and.7.more.pages.-.Personal.-.Microsoft.Edge.2022-03-30.11-58-58.mp4

The animation looks really cool and it's completely removed without this 😢

[fonsp]

Thanks for testing!!