diff --git a/grid.c b/grid.c
index d5d2b37f..0d1db844 100644
--- a/grid.c
+++ b/grid.c
@@ -200,7 +200,7 @@ grid_adjust_lines(struct grid *gd, u_int lines)
 
 /* Copy default into a cell. */
 static void
-grid_clear_cell(struct grid *gd, u_int px, u_int py, u_int bg)
+grid_clear_cell(struct grid *gd, u_int px, u_int py, u_int bg, int moved)
 {
 	struct grid_line	*gl = &gd->linedata[py];
 	struct grid_cell_entry	*gce = &gl->celldata[px];
@@ -209,7 +209,7 @@ grid_clear_cell(struct grid *gd, u_int px, u_int py, u_int bg)
 	int			 had_extd = (gce->flags & GRID_FLAG_EXTENDED);
 
 	memcpy(gce, &grid_cleared_entry, sizeof *gce);
-	if (had_extd && old_offset < gl->extdsize) {
+	if (!moved && had_extd && old_offset < gl->extdsize) {
 		gce->flags |= GRID_FLAG_EXTENDED;
 		gce->offset = old_offset;
 		gee = grid_extended_cell(gl, gce, &grid_cleared_cell);
@@ -515,7 +515,7 @@ grid_expand_line(struct grid *gd, u_int py, u_int sx, u_int bg)
 		    (sx - gl->cellsize) * sizeof *gl->celldata);
 	}
 	for (xx = gl->cellsize; xx < sx; xx++)
-		grid_clear_cell(gd, xx, py, bg);
+		grid_clear_cell(gd, xx, py, bg, 0);
 	gl->cellsize = sx;
 }
 
@@ -683,7 +683,7 @@ grid_clear(struct grid *gd, u_int px, u_int py, u_int nx, u_int ny, u_int bg)
 
 		grid_expand_line(gd, yy, px + ox, 8); /* default bg first */
 		for (xx = px; xx < px + ox; xx++)
-			grid_clear_cell(gd, xx, yy, bg);
+			grid_clear_cell(gd, xx, yy, bg, 0);
 	}
 }
 
@@ -777,7 +777,7 @@ grid_move_cells(struct grid *gd, u_int dx, u_int px, u_int py, u_int nx,
 	for (xx = px; xx < px + nx; xx++) {
 		if (xx >= dx && xx < dx + nx)
 			continue;
-		grid_clear_cell(gd, xx, py, bg);
+		grid_clear_cell(gd, xx, py, bg, 1);
 	}
 }
 
diff --git a/screen.c b/screen.c
index 7ba70ea0..617ac24c 100644
--- a/screen.c
+++ b/screen.c
@@ -760,8 +760,9 @@ screen_mode_to_string(int mode)
 	return (tmp);
 }
 
+/* Convert screen to a string. */
 const char *
-screen_print(struct screen *s)
+screen_print(struct screen *s, int line)
 {
 	static char		*buf;
 	static size_t		 len = 16384;
@@ -777,6 +778,8 @@ screen_print(struct screen *s)
 		buf = xmalloc(len);
 
 	for (y = 0; y < screen_hsize(s) + s->grid->sy; y++) {
+		if (line >= 0 && y != (u_int)line)
+			continue;
 		n = snprintf(buf + last, len - last, "%.4d \"", y);
 		if (n <= 0 || (u_int)n >= len - last)
 			goto out;
diff --git a/tmux.h b/tmux.h
index 87bcac78..49519d0e 100644
--- a/tmux.h
+++ b/tmux.h
@@ -3296,7 +3296,7 @@ int	 screen_select_cell(struct screen *, struct grid_cell *,
 void	 screen_alternate_on(struct screen *, struct grid_cell *, int);
 void	 screen_alternate_off(struct screen *, struct grid_cell *, int);
 const char *screen_mode_to_string(int);
-const char *screen_print(struct screen *);
+const char *screen_print(struct screen *, int);
 
 /* window.c */
 extern struct windows windows;