From ef3c6b788f7dd1c3fff00673998a1db63027a290 Mon Sep 17 00:00:00 2001
From: nicm <nicm@openbsd.org>
Date: Fri, 10 Dec 2021 12:42:37 +0000
Subject: [PATCH] Add a NOBLOCK flag rather than adding amount to wait for when
 dealing with potentially-long sequences. GitHub issue 3001.

---
 usr.bin/tmux/tmux.h |  4 ++--
 usr.bin/tmux/tty.c  | 10 ++++++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/usr.bin/tmux/tmux.h b/usr.bin/tmux/tmux.h
index ec0fb684011..03853e75f95 100644
--- a/usr.bin/tmux/tmux.h
+++ b/usr.bin/tmux/tmux.h
@@ -1,4 +1,4 @@
-/* $OpenBSD: tmux.h,v 1.1155 2021/11/15 10:58:13 nicm Exp $ */
+/* $OpenBSD: tmux.h,v 1.1156 2021/12/10 12:42:37 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -1311,7 +1311,7 @@ struct tty {
 #define TTY_NOCURSOR 0x1
 #define TTY_FREEZE 0x2
 #define TTY_TIMER 0x4
-/* 0x8 unused */
+#define TTY_NOBLOCK 0x8
 #define TTY_STARTED 0x10
 #define TTY_OPENED 0x20
 /* 0x40 unused */
diff --git a/usr.bin/tmux/tty.c b/usr.bin/tmux/tty.c
index f67e9c5bf83..d43097d52d4 100644
--- a/usr.bin/tmux/tty.c
+++ b/usr.bin/tmux/tty.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: tty.c,v 1.413 2021/12/06 10:08:42 nicm Exp $ */
+/* $OpenBSD: tty.c,v 1.414 2021/12/10 12:42:37 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -206,6 +206,11 @@ tty_block_maybe(struct tty *tty)
 	size_t		 size = EVBUFFER_LENGTH(tty->out);
 	struct timeval	 tv = { .tv_usec = TTY_BLOCK_INTERVAL };
 
+	if (size == 0)
+		tty->flags &= ~TTY_NOBLOCK;
+	else if (tty->flags & TTY_NOBLOCK)
+		return (0);
+
 	if (size < TTY_BLOCK_START(tty))
 		return (0);
 
@@ -2088,8 +2093,8 @@ tty_set_selection(struct tty *tty, const char *buf, size_t len)
 	encoded = xmalloc(size);
 
 	b64_ntop(buf, len, encoded, size);
+	tty->flags |= TTY_NOBLOCK;
 	tty_putcode_ptr2(tty, TTYC_MS, "", encoded);
-	tty->client->redraw = EVBUFFER_LENGTH(tty->out);
 
 	free(encoded);
 }
@@ -2097,6 +2102,7 @@ tty_set_selection(struct tty *tty, const char *buf, size_t len)
 void
 tty_cmd_rawstring(struct tty *tty, const struct tty_ctx *ctx)
 {
+	tty->flags |= TTY_NOBLOCK;
 	tty_add(tty, ctx->ptr, ctx->num);
 	tty_invalidate(tty);
 }
-- 
2.20.1