Revert previous, there is still a problem.

screen-redraw.c

@@ -438,24 +438,17 @@ screen_redraw_screen(struct client *c)
 	tty_sync_start(&c->tty);
 
 	if (flags & (CLIENT_REDRAWWINDOW|CLIENT_REDRAWBORDERS)) {
-		log_debug("%s: redrawing borders", c->name);
 		if (ctx.pane_status != PANE_STATUS_OFF)
 			screen_redraw_draw_pane_status(&ctx);
 		screen_redraw_draw_borders(&ctx);
 	}
-	if (flags & CLIENT_REDRAWWINDOW) {
+	if (flags & CLIENT_REDRAWWINDOW)
-		log_debug("%s: redrawing panes", c->name);
 		screen_redraw_draw_panes(&ctx);
-	}
 	if (ctx.statuslines != 0 &&
-	    (flags & (CLIENT_REDRAWSTATUS|CLIENT_REDRAWSTATUSALWAYS))) {
+	    (flags & (CLIENT_REDRAWSTATUS|CLIENT_REDRAWSTATUSALWAYS)))
-		log_debug("%s: redrawing status", c->name);
 		screen_redraw_draw_status(&ctx);
-	}
+	if (c->overlay_draw != NULL && (flags & CLIENT_REDRAWOVERLAY))
-	if (c->overlay_draw != NULL && (flags & CLIENT_REDRAWOVERLAY)) {
-		log_debug("%s: redrawing overlay", c->name);
 		c->overlay_draw(c, &ctx);
-	}
 
 	tty_reset(&c->tty);
 	tty_sync_end(&c->tty);

server-client.c

@@ -1681,7 +1681,7 @@ server_client_check_redraw(struct client *c)
 	struct session		*s = c->session;
 	struct tty		*tty = &c->tty;
 	struct window_pane	*wp;
-	int			 needed, flags, mode = tty->mode, new_flags = 0;
+	int			 needed, flags, mode = tty->mode;
 	struct timeval		 tv = { .tv_usec = 1000 };
 	static struct event	 ev;
 	size_t			 left;
@@ -1689,12 +1689,11 @@ server_client_check_redraw(struct client *c)
 	if (c->flags & (CLIENT_CONTROL|CLIENT_SUSPENDED))
 		return;
 	if (c->flags & CLIENT_ALLREDRAWFLAGS) {
-		log_debug("%s: redraw%s%s%s%s%s", c->name,
+		log_debug("%s: redraw%s%s%s%s", c->name,
 		    (c->flags & CLIENT_REDRAWWINDOW) ? " window" : "",
 		    (c->flags & CLIENT_REDRAWSTATUS) ? " status" : "",
 		    (c->flags & CLIENT_REDRAWBORDERS) ? " borders" : "",
-		    (c->flags & CLIENT_REDRAWOVERLAY) ? " overlay" : "",
+		    (c->flags & CLIENT_REDRAWOVERLAY) ? " overlay" : "");
-		    (c->flags & CLIENT_REDRAWPANES) ? " panes" : "");
 	}
 
 	/*
@@ -1712,8 +1711,6 @@ server_client_check_redraw(struct client *c)
 				break;
 			}
 		}
-		if (needed)
-			new_flags |= CLIENT_REDRAWPANES;
 	}
 	if (needed && (left = EVBUFFER_LENGTH(tty->out)) != 0) {
 		log_debug("%s: redraw deferred (%zu left)", c->name, left);
@@ -1723,7 +1720,12 @@ server_client_check_redraw(struct client *c)
 			log_debug("redraw timer started");
 			evtimer_add(&ev, &tv);
 		}
-		c->flags |= new_flags;
+
+		/*
+		 * We may have got here for a single pane redraw, but force a
+		 * full redraw next time in case other panes have been updated.
+		 */
+		c->flags |= CLIENT_ALLREDRAWFLAGS;
 		return;
 	} else if (needed)
 		log_debug("%s: redraw needed", c->name);
@@ -1739,12 +1741,10 @@ server_client_check_redraw(struct client *c)
 		 */
 		TAILQ_FOREACH(wp, &c->session->curw->window->panes, entry) {
 			if (wp->flags & PANE_REDRAW) {
-				log_debug("%s: redrawing pane %%%u", __func__, wp->id);
 				tty_update_mode(tty, tty->mode, NULL);
 				screen_redraw_pane(c, wp);
 			}
 		}
-		c->flags &= ~CLIENT_REDRAWPANES;
 	}
 
 	if (c->flags & CLIENT_ALLREDRAWFLAGS) {

tmux.h

@@ -1244,7 +1244,6 @@ struct tty {
 #define TTY_BLOCK 0x80
 #define TTY_HAVEDA 0x100
 #define TTY_HAVEDSR 0x200
-#define TTY_SYNCING 0x400
 	int		 flags;
 
 	struct tty_term	*term;
@@ -1539,14 +1538,12 @@ struct client {
 #define CLIENT_CONTROL_NOOUTPUT 0x4000000
 #define CLIENT_DEFAULTSOCKET 0x8000000
 #define CLIENT_STARTSERVER 0x10000000
-#define CLIENT_REDRAWPANES 0x20000000
 #define CLIENT_ALLREDRAWFLAGS		\
 	(CLIENT_REDRAWWINDOW|		\
 	 CLIENT_REDRAWSTATUS|		\
 	 CLIENT_REDRAWSTATUSALWAYS|	\
 	 CLIENT_REDRAWBORDERS|		\
-	 CLIENT_REDRAWOVERLAY|		\
+	 CLIENT_REDRAWOVERLAY)
-	 CLIENT_REDRAWPANES)
 #define CLIENT_UNATTACHEDFLAGS	\
 	(CLIENT_DEAD|		\
 	 CLIENT_SUSPENDED|	\

tty.c

@@ -1438,19 +1438,15 @@ tty_draw_line(struct tty *tty, struct window_pane *wp, struct screen *s,
 void
 tty_sync_start(struct tty *tty)
 {
-	if ((~tty->flags & TTY_SYNCING) && (tty_get_flags(tty) & TERM_SYNC)) {
+	if (tty_get_flags(tty) & TERM_SYNC)
 		tty_puts(tty, "\033P=1s\033\\");
-		tty->flags |= TTY_SYNCING;
-	}
 }
 
 void
 tty_sync_end(struct tty *tty)
 {
-	if (tty_get_flags(tty) & TERM_SYNC) {
+	if (tty_get_flags(tty) & TERM_SYNC)
 		tty_puts(tty, "\033P=2s\033\\");
-		tty->flags &= ~TTY_SYNCING;
-	}
 }
 
 static int
@@ -1484,14 +1480,6 @@ tty_write(void (*cmdfn)(struct tty *, const struct tty_ctx *),
 	TAILQ_FOREACH(c, &clients, entry) {
 		if (!tty_client_ready(c, wp))
 			continue;
-		if (c->flags & CLIENT_REDRAWPANES) {
-			/*
-			 * Redraw is already deferred to redraw another pane -
-			 * redraw this one also when that happens.
-			 */
-			wp->flags |= PANE_REDRAW;
-			break;
-		}
 
 		ctx->bigger = tty_window_offset(&c->tty, &ctx->ox, &ctx->oy,
 		    &ctx->sx, &ctx->sy);