bug#58810: 29.0.50; [PATCH] 'eshell-stringify' sometimes produces wrong results

[Jim Porter]

Starting from "emacs -Q -f -eshell":

  ~ $ echo $(list 'quote 'hello)
  'hell

The last character of "hello" was stripped. That's because 
'eshell-stringify' tries to remove the trailing newline from 
'pp-to-string', but it does so by always stripping the last character 
from the result. Obviously, that only works when the last character 
really is a newline.

Attached is a patch with regression tests for 'eshell-stringify' so that 
this works correctly.

0001-Only-strip-newlines-when-stringifying-a-value-for-Es.patch
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