1 files changed, 47 insertions, 6 deletions

diff --git a/server-client.c b/server-client.c
index 6716b503..aaedebcf 100644
--- a/server-client.c
+++ b/server-client.c
@@ -1036,6 +1036,44 @@ server_client_loop(void)
 	}
 }
 
+/* Check if we need to force a resize. */
+static int
+server_client_resize_force(struct window_pane *wp)
+{
+	struct timeval	tv = { .tv_usec = 100000 };
+	struct winsize	ws;
+
+	/*
+	 * If we are resizing to the same size as when we entered the loop
+	 * (that is, to the same size the application currently thinks it is),
+	 * tmux may have gone through several resizes internally and thrown
+	 * away parts of the screen. So we need the application to actually
+	 * redraw even though its final size has not changed.
+	 */
+
+	if (wp->flags & PANE_RESIZEFORCE) {
+		wp->flags &= ~PANE_RESIZEFORCE;
+		return (0);
+	}
+
+	if (wp->sx != wp->osx ||
+	    wp->sy != wp->osy ||
+	    wp->sx <= 1 ||
+	    wp->sy <= 1)
+		return (0);
+
+	memset(&ws, 0, sizeof ws);
+	ws.ws_col = wp->sx;
+	ws.ws_row = wp->sy - 1;
+	if (ioctl(wp->fd, TIOCSWINSZ, &ws) == -1)
+		fatal("ioctl failed");
+	log_debug("%s: %%%u forcing resize", __func__, wp->id);
+
+	evtimer_add(&wp->resize_timer, &tv);
+	wp->flags |= PANE_RESIZEFORCE;
+	return (1);
+}
+
 /* Resize timer event. */
 static void
 server_client_resize_event(__unused int fd, __unused short events, void *data)
@@ -1047,12 +1085,12 @@ server_client_resize_event(__unused int fd, __unused short events, void *data)
 
 	if (!(wp->flags & PANE_RESIZE))
 		return;
+	if (server_client_resize_force(wp))
+		return;
 
 	memset(&ws, 0, sizeof ws);
 	ws.ws_col = wp->sx;
 	ws.ws_row = wp->sy;
-
-	if (ioctl(wp->fd, TIOCSWINSZ, &ws) == -1) {
 #ifdef __sun
 		/*
 		 * Some versions of Solaris apparently can return an error when
@@ -1066,6 +1104,9 @@ server_client_resize_event(__unused int fd, __unused short events, void *data)
 	}
 
 	wp->flags &= ~PANE_RESIZE;
+
+	wp->osx = wp->sx;
+	wp->osy = wp->sy;
 }
 
 /* Check if pane should be resized. */
@@ -1076,6 +1117,7 @@ server_client_check_resize(struct window_pane *wp)
 
 	if (!(wp->flags & PANE_RESIZE))
 		return;
+	log_debug("%s: %%%u resize to %u,%u", __func__, wp->id, wp->sx, wp->sy);
 
 	if (!event_initialized(&wp->resize_timer))
 		evtimer_set(&wp->resize_timer, server_client_resize_event, wp);
@@ -1436,10 +1478,9 @@ server_client_dispatch(struct imsg *imsg, void *arg)
 
 		if (c->flags & CLIENT_CONTROL)
 			break;
-		if (tty_resize(&c->tty)) {
-			recalculate_sizes();
-			server_redraw_client(c);
-		}
+		tty_resize(&c->tty);
+		recalculate_sizes();
+		server_redraw_client(c);
 		if (c->session != NULL)
 			notify_client("client-resized", c);
 		break;