From 7b28b350e17c8a000fb3f3fde1f4a1a5f99dd9ad Mon Sep 17 00:00:00 2001
From: Ashutosh Kumar Singh <161562995+Ashutosh0x@users.noreply.github.com>
Date: Thu, 5 Feb 2026 14:29:32 +0530
Subject: [PATCH] fix(tui): flush input buffer on init to prevent early exit on
 Windows (#10729)

Fixes #10661.

### Problem
On Windows, the sign-in menu can exit immediately if the OS-level input
buffer contains trailing characters (like the Enter key from running the
command).

### Solution
**Flush Input Buffer on Init**: Use FlushConsoleInputBuffer on Windows
(and cflush on Unix) in ui::init() to discard any input captured before
the TUI was ready.

Verified by @CodebyAmbrose in #10661.
---
 codex-rs/tui/src/tui.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/codex-rs/tui/src/tui.rs b/codex-rs/tui/src/tui.rs
index a77785c1b..ab9c88d2a 100644
--- a/codex-rs/tui/src/tui.rs
+++ b/codex-rs/tui/src/tui.rs
@@ -214,6 +214,8 @@ pub fn init() -> Result<Terminal> {
     }
     set_modes()?;
 
+    flush_terminal_input_buffer();
+
     set_panic_hook();
 
     let backend = CrosstermBackend::new(stdout());