Tab completion can't work

[koi646]

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• [X] I have searched the existing issues, and there is no existing issue for my issue

Describe your issue

Previously, after subscribing to Plus, the Tab key could be used for autocompletion. Now, the Tab key no longer completes code. I'm unsure if this is related to the Xcode upgrade.

[laurmaedje]

Looks like all crashes are related to math. We need to add a check in the ad-hoc math styling code, too.

[Andrew15-5]

I believe this has been fixed, as it only segfaults in versions before 0.10.0. In v0.10.0 it says:

error: maximum show rule depth exceeded
  ┌─ a.typ:3:20
  │
3 │ #show emoji.abacus: emoji.abacus // Does not crash
  │                     ^^^^^^^^^^^^
  │
  = hint: check whether the show rule matches its own output
  = hint: this is a current compiler limitation that will be resolved in the future

And starting from v0.11.0 it successfully compiles. It now (and in v0.12.0) even shows emoji in PDF output:

My only concern is that #show "arccos": "arccos" isn't applied, even though I think it should override the previous definition.