[Bug 5230] New: pager does not work with shell alias

[mercurial-bugs at selenic.com]

https://bz.mercurial-scm.org/show_bug.cgi?id=5230

            Bug ID: 5230
           Summary: pager does not work with shell alias
           Product: Mercurial
           Version: default branch
          Hardware: All
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: wish
         Component: pager
          Assignee: bugzilla at selenic.com
          Reporter: arcppzju+hgbug at gmail.com
                CC: mercurial-devel at selenic.com

dispatch.py will skip extension.loadall() for shell aliases so pager won't work
for shell aliases:

Repro:

cat > hgrc <<'!'
[alias]
a = !echo A
[extensions]
pager =
[pager]
pager = sed 's/^/P/'
attend = a
!

HGRCPATH=hgrc hg a

Expected:
PA

Actual:
A

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