gentoo-overlay/app-shells/bash/files/bash-5.0-history-zero-length.patch

*** ../bash-5.0-patched/bashhist.c	2018-07-05 22:41:14.000000000 -0400
--- bashhist.c	2019-02-20 16:20:04.000000000 -0500
***************
*** 561,573 ****
    if (!history_expansion_inhibited && history_expansion && history_expansion_p (line))
      {
        /* If we are expanding the second or later line of a multi-line
  	 command, decrease history_length so references to history expansions
  	 in these lines refer to the previous history entry and not the
  	 current command. */
        if (history_length > 0 && command_oriented_history && current_command_first_line_saved && current_command_line_count > 1)
          history_length--;
        expanded = history_expand (line, &history_value);
        if (history_length >= 0 && command_oriented_history && current_command_first_line_saved && current_command_line_count > 1)
!         history_length++;
  
        if (expanded)
--- 561,576 ----
    if (!history_expansion_inhibited && history_expansion && history_expansion_p (line))
      {
+       int old_len;
+ 
        /* If we are expanding the second or later line of a multi-line
  	 command, decrease history_length so references to history expansions
  	 in these lines refer to the previous history entry and not the
  	 current command. */
+       old_len = history_length;
        if (history_length > 0 && command_oriented_history && current_command_first_line_saved && current_command_line_count > 1)
          history_length--;
        expanded = history_expand (line, &history_value);
        if (history_length >= 0 && command_oriented_history && current_command_first_line_saved && current_command_line_count > 1)
!         history_length = old_len;
  
        if (expanded)