From 4bc0a83d51624911195fb4b033f51aa7bca43e54 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 20 Apr 2020 06:07:39 +0000
Subject: [PATCH 1/2] Need to check for pane redrawing even if just the window
 flag is set (the pane flag may not have been previously set to avoid looping
 the windows).

---
 server-client.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/server-client.c b/server-client.c
index 6eda2b45..18f44ff9 100644
--- a/server-client.c
+++ b/server-client.c
@@ -1726,11 +1726,15 @@ server_client_check_redraw(struct client *c)
 			log_debug("redraw timer started");
 			evtimer_add(&ev, &tv);
 		}
-		if (new_flags & CLIENT_REDRAWPANES) {
+
+		if (~c->flags & CLIENT_REDRAWWINDOW) {
 			c->redraw_panes = 0;
 			TAILQ_FOREACH(wp, &w->panes, entry) {
-				if (wp->flags & PANE_REDRAW)
+				if (wp->flags & PANE_REDRAW) {
+					log_debug("%s: pane %%%u needs redraw",
+					    c->name, wp->id);
 					c->redraw_panes |= (1 << bit);
+				}
 				if (++bit == 64) {
 					/*
 					 * If more that 64 panes, give up and
@@ -1741,6 +1745,8 @@ server_client_check_redraw(struct client *c)
 					break;
 				}
 			}
+			if (c->redraw_panes != 0)
+				c->flags |= CLIENT_REDRAWPANES;
 		}
 		c->flags |= new_flags;
 		return;

From b846ec266571be41e84ebda4480484db73416c81 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 20 Apr 2020 06:08:37 +0000
Subject: [PATCH 2/2] Only trim blank lines when the source pane is not the
 target pane, otherwise the cursor moves which is a bit strange.

---
 window-copy.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/window-copy.c b/window-copy.c
index 45a47675..2bda5d56 100644
--- a/window-copy.c
+++ b/window-copy.c
@@ -299,7 +299,7 @@ window_copy_scroll_timer(__unused int fd, __unused short events, void *arg)
 
 static struct screen *
 window_copy_clone_screen(struct screen *src, struct screen *hint, u_int *cx,
-    u_int *cy)
+    u_int *cy, int trim)
 {
 	struct screen		*dst;
 	u_int			 sy;
@@ -308,11 +308,13 @@ window_copy_clone_screen(struct screen *src, struct screen *hint, u_int *cx,
 	dst = xcalloc(1, sizeof *dst);
 
 	sy = screen_hsize(src) + screen_size_y(src);
-	while (sy > screen_hsize(src)) {
-		gl = grid_peek_line(src->grid, sy - 1);
-		if (gl->cellused != 0)
-			break;
-		sy--;
+	if (trim) {
+		while (sy > screen_hsize(src)) {
+			gl = grid_peek_line(src->grid, sy - 1);
+			if (gl->cellused != 0)
+				break;
+			sy--;
+		}
 	}
 	log_debug("%s: target screen is %ux%u, source %ux%u", __func__,
 	    screen_size_x(src), sy, screen_size_x(hint),
@@ -386,7 +388,8 @@ window_copy_init(struct window_mode_entry *wme,
 	u_int				 i, cx, cy;
 
 	data = window_copy_common_init(wme);
-	data->backing = window_copy_clone_screen(base, &data->screen, &cx, &cy);
+	data->backing = window_copy_clone_screen(base, &data->screen, &cx, &cy,
+	    wme->swp != wme->wp);
 
 	if (cy < screen_hsize(data->backing)) {
 		data->cx = cx;
@@ -2042,7 +2045,7 @@ window_copy_cmd_refresh_from_pane(struct window_copy_cmd_state *cs)
 	screen_free(data->backing);
 	free(data->backing);
 	data->backing = window_copy_clone_screen(&wp->base, &data->screen, NULL,
-	    NULL);
+	    NULL, wme->swp != wme->wp);
 
 	window_copy_size_changed(wme);
 	return (WINDOW_COPY_CMD_REDRAW);