vim: Add g? convert to Rot13/Rot47 (#27824)

Release Notes:

- Added `g?` convert to `Rot13`/`Rot47`

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/editor/src/editor.rs

@@ -9168,6 +9168,42 @@ impl Editor {
         })
     }
 
+    pub fn convert_to_rot13(
+        &mut self,
+        _: &ConvertToRot13,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        self.manipulate_text(window, cx, |text| {
+            text.chars()
+                .map(|c| match c {
+                    'A'..='M' | 'a'..='m' => ((c as u8) + 13) as char,
+                    'N'..='Z' | 'n'..='z' => ((c as u8) - 13) as char,
+                    _ => c,
+                })
+                .collect()
+        })
+    }
+
+    pub fn convert_to_rot47(
+        &mut self,
+        _: &ConvertToRot47,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        self.manipulate_text(window, cx, |text| {
+            text.chars()
+                .map(|c| {
+                    let code_point = c as u32;
+                    if code_point >= 33 && code_point <= 126 {
+                        return char::from_u32(33 + ((code_point + 14) % 94)).unwrap();
+                    }
+                    c
+                })
+                .collect()
+        })
+    }
+
     fn manipulate_text<Fn>(&mut self, window: &mut Window, cx: &mut Context<Self>, mut callback: Fn)
     where
         Fn: FnMut(&str) -> String,