lib/56647: Fix misbehaviour in libedit support for readline

[walter.lozano%collabora.com@localhost]

>Number:         56647
>Category:       lib
>Synopsis:       Fix misbehaviour in libedit support for readline
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    lib-bug-people
>State:          open
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Thu Jan 20 16:20:00 +0000 2022
>Originator:     Walter Lozano
>Release:        
>Organization:
Collabora
>Environment:
>Description:
Currently libedit does not properly:
- Updates rl_point and rl_end when using callback
- Does not update the screen with buffer contents when using rl_redisplay 
>How-To-Repeat:

>Fix:
A possible improvement is in the patch below.

The _rl_update_pos() seems to be required in the callback is order to be able to use functions like rl_copy_text() or rl_replace_line().

For the update part, I still don't understand the whole refresh process, but I think that the patch is a step in the right direction.

Index: readline.c
===================================================================
RCS file: /cvsroot/src/lib/libedit/readline.c,v
retrieving revision 1.169
diff -r1.169 readline.c
2151a2152
> 	_rl_update_pos();
2175a2177,2178
> 
> 	rl_forced_update_display();