bug#42621: 26.3; Scheme mode: Wrong indentation (no indentation) when pressing tab

[Eli Zaretskii]

> From: Kjetil Matheussen <k.s.matheussen@gmail.com>
> Date: Thu, 6 Aug 2020 10:32:30 +0200
> Cc: 42621@debbugs.gnu.org, Kjetil Matheussen <k.s.matheussen@notam02.no>
> 
> 1. wget http://users.notam02.no/~kjetism/emacsindentationbug.scm
> 2. emacs -Q emacsindentationbug.scm
> 3. maximize emacs window
> 4. Press Ctrl + S, search for "define column-widths"
> 5. The cursor should now be placed at line 2790
> 6. Press down-arrow so that that cursor is placed at line 2791
> 7. Press up -arrow so that the cursor is placed at line 2790 again.
> 8. Press TAB.
> 9. The line is wrongly indented (no indentation).

FWIW, I cannot reproduce even with this recipe: in my case the
indentation stays at its original form, i.e. 2 columns.