When a redraw is deferred because the terminal hasn't finished reading

the data from the last one, other panes could update while waiting, so
we set the flag to redraw them all when the new redraw actually
happened. But this means a lot of redrawing panes unnecessarily if they
haven't changed - so instead set a flag to say "at least one pane needs
to be redrawed" then look at the invidual pane flags to see which ones
need it.

1 files changed, 14 insertions, 2 deletions

diff --git a/tty.c b/tty.c
index 82436959..a50db799 100644
--- a/tty.c
+++ b/tty.c
@@ -1438,15 +1438,19 @@ tty_draw_line(struct tty *tty, struct window_pane *wp, struct screen *s,
 void
 tty_sync_start(struct tty *tty)
 {
-	if (tty_get_flags(tty) & TERM_SYNC)
+	if ((~tty->flags & TTY_SYNCING) && (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
@@ -1480,6 +1484,14 @@ 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);