Adjust latest client when a client detaches, GitHub issue 2657.

1 files changed, 39 insertions, 2 deletions

diff --git a/usr.bin/tmux/server-client.c b/usr.bin/tmux/server-client.c
index ddb09ac390f..03b622e8d7c 100644
--- a/usr.bin/tmux/server-client.c
+++ b/usr.bin/tmux/server-client.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: server-client.c,v 1.372 2021/04/12 09:36:12 nicm Exp $ */
+/* $OpenBSD: server-client.c,v 1.373 2021/06/10 07:21:46 nicm Exp $ */
 
 /*
  * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
@@ -46,6 +46,7 @@ static void	server_client_check_modes(struct client *);
 static void	server_client_set_title(struct client *);
 static void	server_client_reset_state(struct client *);
 static int	server_client_assume_paste(struct session *);
+static void	server_client_update_latest(struct client *);
 
 static void	server_client_dispatch(struct imsg *, void *);
 static void	server_client_dispatch_command(struct client *, struct imsg *);
@@ -274,6 +275,40 @@ server_client_open(struct client *c, char **cause)
 	return (0);
 }
 
+/* Lost an attached client. */
+static void
+server_client_attached_lost(struct client *c)
+{
+	struct session	*s = c->session;
+	struct window	*w;
+	struct client	*loop;
+	struct client	*found;
+
+	log_debug("lost attached client %p", c);
+
+	/*
+	 * By this point the session in the client has been cleared so walk all
+	 * windows to find any with this client as the latest.
+	 */
+	RB_FOREACH(w, windows, &windows) {
+		if (w->latest != c)
+			continue;
+
+		found = NULL;
+		TAILQ_FOREACH(loop, &clients, entry) {
+			s = loop->session;
+			if (loop == c || s == NULL || s->curw->window != w)
+				continue;
+			if (found == NULL ||
+			    timercmp(&loop->activity_time, &found->activity_time,
+			    >))
+				found = loop;
+		}
+		if (found != NULL)
+			server_client_update_latest(found);
+	}
+}
+
 /* Lost a client. */
 void
 server_client_lost(struct client *c)
@@ -299,8 +334,10 @@ server_client_lost(struct client *c)
 	TAILQ_REMOVE(&clients, c, entry);
 	log_debug("lost client %p", c);
 
-	if (c->flags & CLIENT_ATTACHED)
+	if (c->flags & CLIENT_ATTACHED) {
+		server_client_attached_lost(c);
 		notify_client("client-detached", c);
+	}
 
 	if (c->flags & CLIENT_CONTROL)
 		control_stop(c);