[BUG] zle reset-prompt clears complist menu when not initiated by the user

[Marlon Richert <marlon.richert@xxxxxxxxx>]

For example:

% trap 'RPS1=$SECONDS; zle reset-prompt' ALRM
% TMOUT=1
% zmodload zsh/complist
% bindkey '^I' menu-select
% cd /<TAB>

The complist menu will appear, but then again disappear when the
prompt updates, leaving only the currently selected item visible.

This also happens when zle reset-prompt is called from a zle -F handler.

zle redisplay has the same problem, too.

On the other hand, if we bind reset-prompt to a key and press it while
the complist menu is active, this works just fine.