Autocompletion for name literals includes suggestion for `Name`, not the namespace of the name being constructed

Prerequisites

Please put an X between the brackets as you perform the following steps:

• Check that your issue is not already filed:
  https://github.com/leanprover/lean4/issues
• Reduce the issue to a minimal, self-contained, reproducible test case.
  Avoid dependencies to Mathlib or Batteries.
• Test your test case against the latest nightly release, for example on
  https://live.lean-lang.org/#project=lean-nightly
  (You can also use the settings there to switch to “Lean nightly”)

Description

If I type

import Lean

#check ``Complement. 

then I get autocompletion suggestions like anyS, which is a function on Lean.Name. Accepting this suggestion completes to

#check ``Complement.anyS

which is an error.

If I type

import Lean

#check ``Complement.comp

then I get exactly two suggestions: components and componentsRev (both are functions on Lean.Name).

However, if I type

import Lean

#check ``Complement.compl

then I get the expected suggestion, namely complement.

Expected behavior: In all three cases, complement should be suggested and nothing else.

Actual behavior: See above

Versions

4.19.0-nightly-2025-03-12 on live.lean-lang.org

Impact

Add 👍 to issues you consider important. If others are impacted by this issue, please ask them to add 👍 to it.

Reproduce the three minimal examples in live.lean-lang.org using Lean nightly and compare the autocompletion results for Complement., Complement.comp, and Complement.compl. Investigate the name-literal completion entry point responsible for these suggestions; done means all three forms suggest only complement and accept it without producing an error.