Sync OpenBSD patchset 999:

Add an option to disable the window rename escape sequence, from Romain
Francoise.

input.c

@@ -1558,6 +1558,8 @@ input_exit_rename(struct input_ctx *ictx)
 {
 	if (ictx->flags & INPUT_DISCARD)
 		return;
+	if (!options_get_number(&ictx->wp->window->options, "allow-rename"))
+		return;
 	log_debug("%s: \"%s\"", __func__, ictx->input_buf);
 
 	xfree(ictx->wp->window->name);

options-table.c

@@ -435,6 +435,11 @@ const struct options_table_entry window_options_table[] = {
 	  .default_num = 0
 	},
 
+	{ .name = "allow-rename",
+	  .type = OPTIONS_TABLE_FLAG,
+	  .default_num = 1
+	},
+
 	{ .name = "alternate-screen",
 	  .type = OPTIONS_TABLE_FLAG,
 	  .default_num = 1

tmux.1

@@ -2346,6 +2346,13 @@ this option is good for full-screen programs which support
 .Dv SIGWINCH
 and poor for interactive programs such as shells.
 .Pp
+.It Xo Ic allow-rename
+.Op Ic on | off
+.Xc
+Allow programs to change the window name using a terminal escape
+sequence (\\033k...\\033\\\\).
+The default is on.
+.Pp
 .It Xo Ic alternate-screen
 .Op Ic on | off
 .Xc