Restore omitted menu keybindings for tab and shift-tab

Functions/Init/.autocomplete__key-bindings

@@ -30,16 +30,20 @@ ${0}:bind() {
 ${0}:bind   up-line-or-search   up-history '^P' 'k' $key_up[@]
 ${0}:bind down-line-or-select down-history '^N' 'j' $key_down[@]
 
+local backtab=$terminfo[kcbt]
+
 menukeys+=(
+                '\t' accept-line
                 '^@' accept-and-hold
                '^[v' accept-and-hold
                 '^_' undo
                '^[u' undo
     "$terminfo[kpp]" backward-word
     "$terminfo[knp]"  forward-word
 )
+bindkey -M menuselect -s "$backtab" "^_$backtab"
+
 
-local backtab=$terminfo[kcbt]
 main+=(
           '\t' complete-word
     "$backtab" insert-unambiguous-or-complete

README.md

@@ -132,7 +132,7 @@ bindkey "$terminfo[kcbt]" menu-select
 
 #### Make <kbd>Tab</kbd> and <kbd>Shift</kbd><kbd>Tab</kbd> change the selection in the menu
 This makes <kbd>Tab</kbd> and <kbd>Shift</kbd><kbd>Tab</kbd> move the selection in the menu right
-and left, respectively, instead of exiting the menu or exiting menu search:
+and left, respectively, instead of exiting the menu:
 ```sh
 bindkey -M menuselect              '^I'         menu-complete
 bindkey -M menuselect "$terminfo[kcbt]" reverse-menu-complete
@@ -161,7 +161,6 @@ bindkey '^S' .history-incremental-search-forward
 ```
 
 ### Pass arguments to `compinit`
-
 If necessary, you can let Autocomplete pass arguments to `compinit` as follows:
 ```sh
 zstyle '*:compinit' arguments -D -i -u -C -w