Revert "Probe for kitty keyboard protocol support"

This needs to be tested more, it has shown issues in MS conhost,
and potentially others.

Changing strategy after beta isn't the greatest idea.

This reverts commit 4decacb933.

See #10994

src/bin/fish_key_reader.rs

@@ -9,19 +9,19 @@
 
 use std::{ops::ControlFlow, os::unix::prelude::OsStrExt};
 
-use libc::{STDIN_FILENO, STDOUT_FILENO, TCSANOW, VEOF, VINTR};
+use libc::{STDIN_FILENO, TCSANOW, VEOF, VINTR};
 
 #[allow(unused_imports)]
 use fish::future::IsSomeAnd;
 use fish::{
     builtins::shared::BUILTIN_ERR_UNKNOWN,
-    common::{shell_modes, str2wcstring, write_loop, PROGRAM_NAME},
+    common::{shell_modes, str2wcstring, PROGRAM_NAME},
     env::env_init,
     eprintf, fprintf,
     input::input_terminfo_get_name,
     input_common::{
         terminal_protocol_hacks, terminal_protocols_enable_ifn, CharEvent, InputEventQueue,
-        InputEventQueuer, KITTY_PROGRESSIVE_ENHANCEMENTS_QUERY,
+        InputEventQueuer,
     },
     key::{self, char_to_symbol, Key},
     panic::panic_handler,
@@ -140,7 +140,6 @@ fn setup_and_process_keys(continuous_mode: bool, verbose: bool) -> i32 {
     unsafe { libc::tcsetattr(STDIN_FILENO, TCSANOW, &*shell_modes()) };
 
     terminal_protocol_hacks();
-    let _ = write_loop(&STDOUT_FILENO, KITTY_PROGRESSIVE_ENHANCEMENTS_QUERY);
 
     if continuous_mode {
         eprintf!("\n");

src/input_common.rs

@@ -431,19 +431,10 @@ pub fn update_wait_on_sequence_key_ms(vars: &EnvStack) {
 
 static TERMINAL_PROTOCOLS: AtomicBool = AtomicBool::new(false);
 
-static KITTY_KEYBOARD_SUPPORTED: RelaxedAtomicBool = RelaxedAtomicBool::new(false);
-
-macro_rules! kitty_progressive_enhancements {
-    () => {
-        "\x1b[=5u"
-    };
-}
-
-pub const KITTY_PROGRESSIVE_ENHANCEMENTS_QUERY: &[u8] = b"\x1b[?u";
-
 static IS_TMUX: RelaxedAtomicBool = RelaxedAtomicBool::new(false);
 pub static IN_MIDNIGHT_COMMANDER_PRE_CSI_U: RelaxedAtomicBool = RelaxedAtomicBool::new(false);
 static IN_ITERM_PRE_CSI_U: RelaxedAtomicBool = RelaxedAtomicBool::new(false);
+static IN_JETBRAINS: RelaxedAtomicBool = RelaxedAtomicBool::new(false);
 
 pub fn terminal_protocol_hacks() {
     use std::env::var_os;
@@ -458,6 +449,10 @@ pub fn terminal_protocol_hacks() {
                 version < (3, 5, 6)
             }),
     );
+    IN_JETBRAINS.store(
+        var_os("TERMINAL_EMULATOR")
+            .is_some_and(|term| term.as_os_str().as_bytes() == b"JetBrains-JediTerm"),
+    );
 }
 
 fn parse_version(version: &wstr) -> Option<(i64, i64, i64)> {
@@ -488,14 +483,15 @@ pub fn terminal_protocols_enable_ifn() {
         "\x1b[?2004h"
     } else if IN_ITERM_PRE_CSI_U.load() {
         concat!("\x1b[?2004h", "\x1b[>4;1m", "\x1b[>5u", "\x1b=",)
-    } else if !KITTY_KEYBOARD_SUPPORTED.load() {
+    } else if IN_JETBRAINS.load() {
+        // Jetbrains IDE terminals vomit CSI u
         concat!("\x1b[?2004h", "\x1b[>4;1m", "\x1b=",)
     } else {
         concat!(
             "\x1b[?2004h", // Bracketed paste
             "\x1b[>4;1m",  // XTerm's modifyOtherKeys
-            kitty_progressive_enhancements!(),
-            "\x1b=", // set application keypad mode, so the keypad keys send unique codes
+            "\x1b[=5u",    // CSI u with kitty progressive enhancement
+            "\x1b=",       // set application keypad mode, so the keypad keys send unique codes
         )
     };
     FLOG!(term_protocols, "Enabling extended keys and bracketed paste");
@@ -512,7 +508,7 @@ pub(crate) fn terminal_protocols_disable_ifn() {
     }
     let sequences = if IN_ITERM_PRE_CSI_U.load() {
         concat!("\x1b[?2004l", "\x1b[>4;0m", "\x1b[<1u", "\x1b>",)
-    } else if !KITTY_KEYBOARD_SUPPORTED.load() {
+    } else if IN_JETBRAINS.load() {
         concat!("\x1b[?2004l", "\x1b[>4;0m", "\x1b>",)
     } else {
         concat!(
@@ -993,21 +989,6 @@ pub trait InputEventQueuer {
                 _ => return None,
             },
             b'u' => {
-                if private_mode == Some(b'?') {
-                    FLOG!(
-                        reader,
-                        "Received kitty progressive enhancement flags, marking as supported"
-                    );
-                    KITTY_KEYBOARD_SUPPORTED.store(true);
-                    if !IN_MIDNIGHT_COMMANDER_PRE_CSI_U.load() && !IN_ITERM_PRE_CSI_U.load() {
-                        let _ = write_loop(
-                            &STDOUT_FILENO,
-                            kitty_progressive_enhancements!().as_bytes(),
-                        );
-                    }
-                    return None;
-                }
-
                 // Treat numpad keys the same as their non-numpad counterparts. Could add a numpad modifier here.
                 let key = match params[0][0] {
                     57399 => '0',

src/reader.rs

@@ -78,7 +78,6 @@ use crate::history::{
 use crate::input::init_input;
 use crate::input_common::terminal_protocols_disable_ifn;
 use crate::input_common::IN_MIDNIGHT_COMMANDER_PRE_CSI_U;
-use crate::input_common::KITTY_PROGRESSIVE_ENHANCEMENTS_QUERY;
 use crate::input_common::{
     terminal_protocol_hacks, terminal_protocols_enable_ifn, CharEvent, CharInputStyle, InputData,
     ReadlineCmd,
@@ -1933,13 +1932,6 @@ impl<'a> Reader<'a> {
             }
         }
 
-        static queried: RelaxedAtomicBool = RelaxedAtomicBool::new(false);
-        if !queried.load() {
-            queried.store(true);
-            // Query for kitty keyboard protocol support.
-            let _ = write_loop(&STDOUT_FILENO, KITTY_PROGRESSIVE_ENHANCEMENTS_QUERY);
-        }
-
         // HACK: Don't abandon line for the first prompt, because
         // if we're started with the terminal it might not have settled,
         // so the width is quite likely to be in flight.