Problem: Cmdline pum doesn't work properly with 'rightleft'.
Solution: Don't use curwin->w_p_rl in cmdline mode in pum_redraw(). Use
a static variable since pum_may_redraw() may be called in any
mode. Also correct position of other popups with 'rightleft'.
(zeertzjq)
closes: vim/vim#15005883018feff