fix: use a less intrusive DSR instead of DA1 workaround to forward terminal responses twice in tmux (#2058)

Author: sxyazi

yazi-adapter/src/emulator.rs

@@ -47,6 +47,8 @@ impl Emulator {
 		)?;
 
 		let resp = futures::executor::block_on(Self::read_until_da1());
+		Mux::tmux_drain()?;
+
 		let kind = if let Some(brand) = Brand::from_csi(&resp) {
 			Either::Left(brand)
 		} else {
@@ -130,6 +132,31 @@ impl Emulator {
 		String::from_utf8_lossy(&buf).into_owned()
 	}
 
+	pub async fn read_until_dsr() -> String {
+		let mut buf: Vec<u8> = Vec::with_capacity(200);
+		let read = async {
+			let mut stdin = BufReader::new(tokio::io::stdin());
+			loop {
+				let mut c = [0; 1];
+				if stdin.read(&mut c).await? == 0 {
+					bail!("unexpected EOF");
+				}
+				buf.push(c[0]);
+				if c[0] == b'n' && (buf.ends_with(b"\x1b[0n") || buf.ends_with(b"\x1b[3n")) {
+					break;
+				}
+			}
+			Ok(())
+		};
+
+		match timeout(Duration::from_secs(10), read).await {
+			Err(e) => error!("read_until_dsr timed out: {buf:?}, error: {e:?}"),
+			Ok(Err(e)) => error!("read_until_dsr failed: {buf:?}, error: {e:?}"),
+			Ok(Ok(())) => debug!("read_until_dsr: {buf:?}"),
+		}
+		String::from_utf8_lossy(&buf).into_owned()
+	}
+
 	fn detect_base() -> Result<Self> {
 		defer! { disable_raw_mode().ok(); }
 		enable_raw_mode()?;
@@ -142,6 +169,8 @@ impl Emulator {
 		)?;
 
 		let resp = futures::executor::block_on(Self::read_until_da1());
+		Mux::tmux_drain()?;
+
 		Ok(Self {
 			light: Self::light_bg(&resp).unwrap_or_default(),
 			cell_size: Self::cell_size(&resp),

yazi-adapter/src/mux.rs

@@ -1,7 +1,8 @@
+use anyhow::Result;
 use tracing::error;
 use yazi_shared::env_exists;
 
-use crate::{CLOSE, ESCAPE, NVIM, START, TMUX};
+use crate::{CLOSE, ESCAPE, Emulator, NVIM, START, TMUX};
 
 pub struct Mux;
 
@@ -47,6 +48,14 @@ impl Mux {
 		1
 	}
 
+	pub fn tmux_drain() -> Result<()> {
+		if *TMUX == 2 && !*NVIM {
+			crossterm::execute!(std::io::stderr(), crossterm::style::Print(Mux::csi("\x1b[5n")))?;
+			_ = futures::executor::block_on(Emulator::read_until_dsr());
+		}
+		Ok(())
+	}
+
 	pub fn tmux_sixel_flag() -> &'static str {
 		let stdout = std::process::Command::new("tmux")
 			.args(["-LwU0dju1is5", "-f/dev/null", "start", ";", "display", "-p", "#{sixel_support}"])

yazi-fm/src/term.rs

@@ -42,6 +42,8 @@ impl Term {
 		)?;
 
 		let da = futures::executor::block_on(Emulator::read_until_da1());
+		Mux::tmux_drain()?;
+
 		CSI_U.store(da.contains("\x1b[?0u"), Ordering::Relaxed);
 		BLINK.store(da.contains("\x1b[?12;1$y"), Ordering::Relaxed);
 		SHAPE.store(