nu: Add partial auto suggestion completion

The suggested history completion on the reedline (i.e. fish-like
autosuggestion) can be fully completed with the `l` key in vi cmd mode.

This change adds the ability to complete the suggestion partially by
completing the current word using `e`. If no history suggestion exists
it moves to the end of the current word as usual.

This mimics the partial completion I have set up in zsh with the help of
the `zsh-autosuggestions` plugin.

terminal/.config/nushell/config.nu

@@ -55,6 +55,7 @@ $env.config.keybindings = [
             {send: Enter}
         ]
     }
+    # reedline edits
     {
         name: insert_last_token
         modifier: alt
@@ -80,10 +81,23 @@ $env.config.keybindings = [
         keycode: char_s
         mode: [emacs vi_insert vi_normal]
         event: {
-            send: executehostcommand
+            send: ExecuteHostCommand
             cmd: "let cmd = (commandline); commandline edit (if $cmd starts-with sudo { $cmd | str replace -r '^sudo ' '' } else { 'sudo ' ++ $cmd });"
         }
     }
+    {
+        name: partial_history_complete
+        modifier: None
+        keycode: char_e
+        mode: [vi_normal]
+        event: {
+            until: [
+                { send: HistoryHintWordComplete }
+                { edit: MoveWordRight }
+            ]
+        }
+    }
+    # file menus
     {
         name: run_zoxide
         modifier: alt