The current implementation of readline implements the redisplay function, but not the forced version. This patch maintains the current behavior as the default, but also allows a bool to be passed which, if True, calls rl_forced_update_display instead.

Hi,

I'm also interrested in this feature. Indeed, exporting rl_forced_update_display() is the only way I've found to make readline.set_completion_display_matches_hook() working properly. Without forcing the redisplay, the prompt is not displayed. This seems to be the proper function to call, because that's the one called at the end of display_matches() in libreadline code, which is the default function for displaying matches.

The attached file is a simple example code derived from http://pymotw.com/2/readline/ that shows that the patch is working.

By the way, I have my own implementation of the patch that did before checking the issue tracker. Instead of adding an argument to readline.redisplay(), it adds a new function readline.forced_update_display().

I attach the patch for reference, I don't know what is the preferred way to add this feature.

There are actually a few other patches open adding wrappers for rl_forced_update_display():

* Issue 1175004: From 2005, other APIs as well
* Issue 24727: Includes documentation

As well as the documentation, I think it would be good to add a test case for new functionality if possible.