CodeMirror 0.50.2 bug

[karlwessel]

This is a strange one...

When I have the following notebook (which is not the real code but a meaningless MWE):

### A Pluto.jl notebook ###
# v0.5.20
# ╔═╡ ff8b2572-7bbb-11ea-3513-175ab56e1fd7
x = [1,2]

# ╔═╡ 0ffef548-7bba-11ea-3b0c-511048e9d2f4
[(x[2])]

# ╔═╡ Cell order:
# ○ ff8b2572-7bbb-11ea-3513-175ab56e1fd7
# ○ 0ffef548-7bba-11ea-3b0c-511048e9d2f4

and in the second cell try to delete the [ between the x and the 2 in [(x[2])] the browser tab hangs. Always.

The first cell actually doesn't matter. The same also happens if the notebook only contains the second cell. I only added it to demonstrate that the code is ok.

The bracket combination in the second cell seems to actually matter somewhat. At least I wasn't able to remove any of them to reduce the MWE further.

Although this might seem like a corner case, it actually happened more than once now for me while working with actual notebooks.

This happens with Chromium and Firefox.

[fonsp]

I'll look into this right now! Thanks for the MWE - breaks for me too.

[fonsp]

Unfortunately the problem is in the CodeMirror formatter (it also breaks in a standalone editor), I'll try to fix it and send them a PR.

It looks like the problem is having a pair round brackets intersect a pair of square brackets, i.e.

(...[...)...]

[fonsp]

I've submitted an Issue with CodeMirror and downgraded CodeMirror to 5.50.0 as a temporary fix (in the upcoming Pluto 0.5.21).

[fonsp]

Marijn fixed the CodeMirror bug! Will be fixed here when CodeMirror releases their next version.