bug#50187: 28.0.50; tramp is called from calendar

[Steingold]

I get this trace:

--8<---------------cut here---------------start------------->8---
  tramp-file-name-handler(file-readable-p 
"/scp:remote:/path/Contents/Resources/site-lisp/cal-move.so")
  calendar-cursor-to-visible-date((8 24 2021))
  calendar-generate-window(8 2021)
  calendar-basic-setup(nil)
  calendar()
  run-hooks(midnight-hook)
  apply(run-hooks midnight-hook)
  timer-event-handler([t 24869 56416 388128 86400 run-hooks (midnight-hook) nil 
0])
--8<---------------cut here---------------end--------------->8---

I do have a file "/scp:remote:/path/foo/bar/baz.py" open.
"remote" is not accessible because the VPN is down.
"/scp:remote:/path/" is the location of the .git directory for baz.py.
"remote" is linux, localhost is mac. of course there is no
Contents/Resources/site-lisp/cal-move.so on "remote".
How come "calendar" calls "tramp"?
when I click on the function name in *Backtrace* to get to the source
code, tramp is called and I get an infinite loop of
"Tramp: Opening connection nil for remote using scp...failed"
I have to C-g and M-x tramp-cleanup-all-connections to get back to editing.


In GNU Emacs 28.0.50 (build 5, x86_64-apple-darwin19.6.0, NS appkit-1894.60 
Version 10.15.7 (Build 19H1323))
 of 2021-08-23 built on 3c22fb11fdab.ant.amazon.com
Repository revision: 00edc8329a6277f2e5b5204efbe503e2b7957006
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1894
System Description:  Mac OS X 10.15.7

Configured using:
 'configure --with-imagemagick --with-mailutils --with-ns
 
PKG_CONFIG_PATH=/usr/local/opt/libxml2/lib/pkgconfig:/usr/local/opt/imagemagick/lib/pkgconfig:/usr/local/opt/gnutls/lib/pkgconfig:/usr/local/opt/jansson/lib/pkgconfig:/usr/local/opt/libtiff/lib/pkgconfig:/usr/local/opt/libpng/lib/pkgconfig:/usr/local/opt/libjpeg/lib/pkgconfig:/usr/local/opt/freetype/lib/pkgconfig'

Configured features:
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NS PDUMPER PNG THREADS TIFF TOOLKIT_SCROLL_BARS ZLIB

Important settings:
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  value of $LANG: C
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Major mode: VC dir

Minor modes in effect:
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Load-path shadows:
Error during checking
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Memory information:
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-- 
Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1894
http://childpsy.net http://calmchildstories.com http://steingoldpsychology.com
https://jij.org https://www.dhimmitude.org https://www.peaceandtolerance.org/
Genius is immortal, but morons live longer.