vim: Fix some problems with visual mode testing (#8461)

Release Notes:

- N/A

crates/vim/src/state.rs

@@ -1,4 +1,4 @@
-use std::{ops::Range, sync::Arc};
+use std::{fmt::Display, ops::Range, sync::Arc};
 
 use collections::HashMap;
 use gpui::{Action, KeyContext};
@@ -17,6 +17,18 @@ pub enum Mode {
     VisualBlock,
 }
 
+impl Display for Mode {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Mode::Normal => write!(f, "NORMAL"),
+            Mode::Insert => write!(f, "INSERT"),
+            Mode::Visual => write!(f, "VISUAL"),
+            Mode::VisualLine => write!(f, "VISUAL LINE"),
+            Mode::VisualBlock => write!(f, "VISUAL BLOCK"),
+        }
+    }
+}
+
 impl Mode {
     pub fn is_visual(&self) -> bool {
         match self {