From https://ftp.gnu.org/gnu/bash/bash-5.0-patches/bash50-014

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>

			     BASH PATCH REPORT
			     =================

Bash-Release:	5.0
Patch-ID:	bash50-014

Bug-Reported-by:	Johannes Hielscher <jhielscher@posteo.de>
Bug-Reference-ID:	<20190208205048.77c25a83@hordevm>
Bug-Reference-URL:	https://lists.gnu.org/archive/html/bug-bash/2019-02/msg00032.html

Bug-Description:

If the current line is empty, using the emacs C-xC-e binding to enter the
editor will edit the previous command instead of the current (empty) one.

Patch (apply with `patch -p0'):

*** ../bash-5.0-patched/bashline.c	2019-01-16 16:13:21.000000000 -0500
--- b/bashline.c	2019-02-11 11:18:57.000000000 -0500
***************
*** 962,970 ****
  	 finished with the command, so we should not ignore the last command */
        using_history ();
!       if (rl_line_buffer[0])
! 	{
! 	  current_command_line_count++;	/* for rl_newline above */
! 	  bash_add_history (rl_line_buffer);
! 	}
        current_command_line_count = 0;	/* for dummy history entry */
        bash_add_history ("");
--- 965,970 ----
  	 finished with the command, so we should not ignore the last command */
        using_history ();
!       current_command_line_count++;	/* for rl_newline above */
!       bash_add_history (rl_line_buffer);
        current_command_line_count = 0;	/* for dummy history entry */
        bash_add_history ("");
*** ../bash-5.0/patchlevel.h	2016-06-22 14:51:03.000000000 -0400
--- b/patchlevel.h	2016-10-01 11:01:28.000000000 -0400
***************
*** 26,30 ****
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 13
  
  #endif /* _PATCHLEVEL_H_ */
--- 26,30 ----
     looks for to find the patch level (for the sccs version string). */
  
! #define PATCHLEVEL 14
  
  #endif /* _PATCHLEVEL_H_ */