bug#61069: 30.0.50; comint-copy-old-input should include continuation lines

[Bob Rogers]

   From: Eli Zaretskii <eliz@gnu.org>
   Date: Thu, 26 Jan 2023 11:32:52 +0200

   > From: Bob Rogers <rogers@rgrjr.com>
   > Date: Thu, 26 Jan 2023 00:38:56 -0800
   > CC: 61069@debbugs.gnu.org
   >
   > . . .
   > 
   >    > My thought is that C-RET on the "./temacs -batch" line in a
   >    > *shell* buffer should take both that line and the next.
   > 
   >    That has to be an optional feature, probably off by default.
   > 
   > As you like.  Should this be a comint thing, or a shell thing?

   The latter, I think.  Comint handles clients that don't necessarily
   use the backslash convention for continuing lines.

Then the following should fit the bill.  Given that this solution
introduces a defcustom, I imagine it should also have a NEWS item as
well . . .

                                        -- Bob

shell-get-old-input-continuation-lines-1.patch
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