[PATCH] readstr: do not clear undo list

[Grisha Levit]

The undo command fails if invoked via execute-named-command on a
line from the history list:

    $ bash --norc -in <<< $'A\n\cPB\c_C'
    bash-5.3$ A
    bash-5.3$ AC

    $ bash --norc -in <<< $'A\n\cPB\exundo\nC'
    bash-5.3$ A
    bash-5.3$ ABC

AFAICT the rl_maybe_replace_line in _rl_readstr_init is the issue.
---
 lib/readline/text.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/lib/readline/text.c b/lib/readline/text.c
index c5281efe..ad0a325c 100644
--- a/lib/readline/text.c
+++ b/lib/readline/text.c
@@ -2001,7 +2001,6 @@ _rl_readstr_init (int pchar, int flags)
 
   cxt = _rl_rscxt_alloc (flags);
 
-  rl_maybe_replace_line ();
   _rl_saved_line_for_readstr = _rl_alloc_saved_line ();
 
   rl_undo_list = 0;
-- 
2.45.1