[Bug 252663] tcsh history file is not merged

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252663

            Bug ID: 252663
           Summary: tcsh history file is not merged
           Product: Base System
           Version: 12.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: omatsuda000 at gmail.com

The tcsh has been updated to 6.21.00 in FreeBSD 12.2-Release.

Unfortunately, the new tcsh 6.21.00 has a problem on merging histories.
When several tcsh instances are running with the "merge" option for "savehist"
shell variable, each tcsh instance doesn't merge the history list to existing
~/.history on exit: it just overwrites ~/.history with its own history list.

How to reproduce:

1) open two tcsh's (let them as tcsh A and tcsh B) with .cshrc including
      set savehist = (1000 merge)
2) execute
      echo abc
   on tcsh A and then exit
3) execute
      echo def
   on tcsh B and then exit
4) open another tcsh and do "history".
   It only includes "echo def" not "echo abc".
   Of course we expect both "echo abc" and "echo def" were included.

The situation is the same for 13-Current.

To fix this, I found a patch for 6.22.00 at 
https://mailman.astron.com/pipermail/tcsh/2020-February/000072.html

I confirmed that the mentioned patch fixes the problem also for 6.21.00, but
I'm not sure whether the patch has any side effect or not.

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