Syntax highlight stop works when auto-complete query failed

[Slach]

I created gh-api datasource which has restriction to system.* tables
and returns Code: 497. DB::Exception: play: Not enough privileges for auto-complete queries

Thereafter, I tried to make the following actions sequence:

Main menu -> Alert rules -> Add new rule

choose Column timestamp type -> DateTime
select Database, Table and Timestamp column

press Go to query

and syntax highlight stop works

[Slach]

@lunaticusgreen also looks like auto-complete query fetch is synchronous
i mean we wait when it complete before trying to show query editor