[Bug 5228] New: `hg help -e some_disabled_extension` doesn't show help contents

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=5228

            Bug ID: 5228
           Summary: `hg help -e some_disabled_extension` doesn't show help
                    contents
           Product: Mercurial
           Version: 3.8.1
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: feature
          Priority: wish
         Component: Mercurial
          Assignee: bugzilla at selenic.com
          Reporter: develop7 at develop7.info
                CC: mercurial-devel at selenic.com

A user should be able to read complete help for disabled extensions as well.

Repro:

1. Run `hg help -e some_disabled_extension`

Expected: disabled extension help is shown

Instead: only extension summary and `(use "hg help extensions" for information
on enabling extensions)` tip is shown

It's quite easy to work this limitation around by running `hg --config
'extensions.some_disabled_extension=' help -e some_disabled_extension`, but
current behavior IMO violates Principle of Least Surprise. On the other hand,
implementing this proposal would ease deciding whether a user needs certain
extension at all. Obviously, it doesn't mean help for commands defined in
extension should be available.

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