integrate JuliaSyntax.jl

[Pangoraw]

• Investigate time to first parse (seems negligable on v1.9+ add a very basic precompile workload JuliaLang/JuliaSyntax.jl#213)
• Prevent roundtrip to notebook process by making ParseError <: ReactivityError and using relay_reactivity_error!.
• Make each diagnostic clickable and selects the problematic span.
• Find and resolve the CM bug which lead to the update being reverted.
• Cleanup the javascript (replace custom events with hooks?)
• z-index for lint boxes
• parse (debounced) as we type and not just on submit?
• Map highlighted ranges up to date with content?

[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="julia_syntax")
julia> using Pluto

[Pangoraw]

JuliaLang/julia#46372 has been merged 🎊 and JuliaSyntax will become the default parser in 1.10 ! I will come back to this PR and probably drop the JuliaSyntax dependency (make it work only on >=1.10 or with JuliaSyntax + enable_in_core!).

[Pangoraw]

The last problem is z-index positioning of the tooltip which is wrong when the cell is not in focus or with the run button.

I tried setting the z-index for .cm-tooltip but this does not seems to work. Maybe this can be fixed by changing the positioning from fixed to absolute.

The same problem happens with autocompletion tooltip but it is less of a problem (notice the run button over):

Pinging CSS Expert @pankgeorg, you may have an idea on how to fix that ? 😃

[Pangoraw]

I found a solution for the z-index problem above in c45201b. This PR is now ready!

[Pangoraw]

One future improvement is identifying error messages we can propose quick fixes for (like "replace else if with elseif) and add fix actions to the tooltip:

I am going to merge once the CI pass as it only affects 1.10 users for now (and slightly improves the display of syntax errors for VERSION < 1.10).