🐛 Fix mapping restore issue

Author: lambdalisue

autoload/fall/internal/mapping.vim

@@ -5,13 +5,22 @@ function! fall#internal#mapping#store() abort
   let s:saved_maps = maplist()->filter({ _, m -> m.mode ==# 'c' || m.mode ==# '!' })
 endfunction
 
+" NOTE:
+"
+" It seems restore step must be called twice to restore the mappings correctly.
+" Otherwise, mappings with recursive references are not restored correctly.
+"
+" For example:
+"
+" cnoremap <Up> <C-p>
+" cnoremap <C-p> <Up>
+"
 function! fall#internal#mapping#restore()
   if !exists('s:saved_maps')
     return
   endif
   cmapclear
-  for l:m in s:saved_maps
-    call mapset(l:m)
-  endfor
+  call foreach(s:saved_maps, {_, m -> mapset(m)})
+  call foreach(s:saved_maps, {_, m -> mapset(m)})
   unlet s:saved_maps
 endfunction