Content assist / autocomplete hangs the server (latest pgAdmin version)

I had to examine certain aspects of a query that looks like this:

SELECT COUNT(*)
FROM schema.table
WHERE id IN (
'1',
'2',
'3',
....
'19998',
'19999',
'20000'
)

I pasted the query and autocomplete kicked in. For a minute it froze
entirely. Then it sort of let me do things but everything was like in slow
motion: the tree browser, the other SQL tabs - everything became slow as
molasses. I logged onto the server and the "pgAdmin4.py" was
keeping the CPU quite busy. It didn't recover for some time so I simply
restarted the server and switched autocomplete to manual.

Not knowing the design I may not be able to make a viable suggestion but
maybe some sort of complexity counter (configurable or at least hard-coded
at first) should be considered, which would hint to the autocomplete to
stop trying, after it realizes the task may be too complex or takes too
long to complete.

Sure, a query like the one above should probably make use of a temporary
table but it is beyond the point - there has to be a safeguard against an
overloaded autocomplete. Without such a safeguard an ugly/invalid query or
a user error could kill the server for all connected pgadmin clients.

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