fix input encoding for ctrl+letter in kitty mode

2 files changed, 11 insertions, 12 deletions

diff --git a/src/input/encode.rs b/src/input/encode.rs
index 1311d4a0..6599b3ba 100644
--- a/src/input/encode.rs
+++ b/src/input/encode.rs
@@ -151,15 +151,6 @@ fn try_encode_csi_u(key: &TerminalKey, flags: u16) -> Option<Vec<u8>> {
         return None;
     }
 
-    // Plain Ctrl+letter is well-represented in legacy (bytes 1-26)
-    if mods == KeyModifiers::CONTROL {
-        if let KeyCode::Char(c) = key.code {
-            if c.is_ascii_alphabetic() {
-                return None; // let legacy handle it
-            }
-        }
-    }
-
     // Special keys (arrows, F-keys, etc.) have well-established legacy
     // xterm modified formats (\x1b[1;3A for Alt+Up, etc.) that are universally
     // understood. Even Ghostty sends these in legacy format with kitty mode on.
diff --git a/src/input/tests.rs b/src/input/tests.rs
index d624d28a..6e196ad7 100644
--- a/src/input/tests.rs
+++ b/src/input/tests.rs
@@ -295,12 +295,20 @@ fn kitty_alt_enter() {
 }
 
 #[test]
-fn kitty_plain_ctrl_c_uses_legacy() {
-    // Plain Ctrl+letter is well-represented in legacy
+fn kitty_plain_ctrl_c_uses_csi_u() {
     let key = KeyEvent::new(KeyCode::Char('c'), KeyModifiers::CONTROL);
     assert_eq!(
         encode_key(key, KeyboardProtocol::Kitty { flags: 1 }),
-        vec![3]
+        b"\x1b[99;5u"
+    );
+}
+
+#[test]
+fn kitty_plain_ctrl_c_includes_press_event_when_requested() {
+    let key = KeyEvent::new(KeyCode::Char('c'), KeyModifiers::CONTROL);
+    assert_eq!(
+        encode_key(key, KeyboardProtocol::Kitty { flags: 3 }),
+        b"\x1b[99;5:1u"
     );
 }