From 24d7d073fffbf5137176ef474f13f4cfe1f032e9 Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicm@openbsd.org>
Date: Tue, 27 Nov 2012 20:08:42 +0000
Subject: [PATCH] Support the 47 and 1047 SM and RM sequences (alternate screen
 without cursor), requested by I forget who ages ago.

---
 input.c  | 12 ++++++++++--
 tmux.h   |  8 ++++----
 window.c | 18 ++++++++++++------
 3 files changed, 26 insertions(+), 12 deletions(-)

diff --git a/input.c b/input.c
index bc4af1f7..71ef3b00 100644
--- a/input.c
+++ b/input.c
@@ -1255,8 +1255,12 @@ input_csi_dispatch(struct input_ctx *ictx)
 		case 1005:
 			screen_write_utf8mousemode(&ictx->ctx, 0);
 			break;
+		case 47:
+		case 1047:
+			window_pane_alternate_off(wp, &ictx->cell, 0);
+			break;
 		case 1049:
-			window_pane_alternate_off(wp, &ictx->cell);
+			window_pane_alternate_off(wp, &ictx->cell, 1);
 			break;
 		case 2004:
 			screen_write_bracketpaste(&ictx->ctx, 0);
@@ -1310,8 +1314,12 @@ input_csi_dispatch(struct input_ctx *ictx)
 		case 1005:
 			screen_write_utf8mousemode(&ictx->ctx, 1);
 			break;
+		case 47:
+		case 1047:
+			window_pane_alternate_on(wp, &ictx->cell, 0);
+			break;
 		case 1049:
-			window_pane_alternate_on(wp, &ictx->cell);
+			window_pane_alternate_on(wp, &ictx->cell, 1);
 			break;
 		case 2004:
 			screen_write_bracketpaste(&ictx->ctx, 1);
diff --git a/tmux.h b/tmux.h
index 2b5f19d8..8549e142 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2145,10 +2145,10 @@ int		 window_pane_spawn(struct window_pane *, const char *,
 		     const char *, const char *, struct environ *,
 		     struct termios *, char **);
 void		 window_pane_resize(struct window_pane *, u_int, u_int);
-void		 window_pane_alternate_on(
-		     struct window_pane *, struct grid_cell *);
-void		 window_pane_alternate_off(
-		     struct window_pane *, struct grid_cell *);
+void		 window_pane_alternate_on(struct window_pane *,
+		     struct grid_cell *, int);
+void		 window_pane_alternate_off(struct window_pane *,
+		     struct grid_cell *, int);
 int		 window_pane_set_mode(
 		     struct window_pane *, const struct window_mode *);
 void		 window_pane_reset_mode(struct window_pane *);
diff --git a/window.c b/window.c
index fc9fa5f3..97e5b4a3 100644
--- a/window.c
+++ b/window.c
@@ -867,7 +867,8 @@ window_pane_resize(struct window_pane *wp, u_int sx, u_int sy)
  * history is not updated
  */
 void
-window_pane_alternate_on(struct window_pane *wp, struct grid_cell *gc)
+window_pane_alternate_on(struct window_pane *wp, struct grid_cell *gc,
+    int cursor)
 {
 	struct screen	*s = &wp->base;
 	u_int		 sx, sy;
@@ -881,8 +882,10 @@ window_pane_alternate_on(struct window_pane *wp, struct grid_cell *gc)
 
 	wp->saved_grid = grid_create(sx, sy, 0);
 	grid_duplicate_lines(wp->saved_grid, 0, s->grid, screen_hsize(s), sy);
-	wp->saved_cx = s->cx;
-	wp->saved_cy = s->cy;
+	if (cursor) {
+		wp->saved_cx = s->cx;
+		wp->saved_cy = s->cy;
+	}
 	memcpy(&wp->saved_cell, gc, sizeof wp->saved_cell);
 
 	grid_view_clear(s->grid, 0, 0, sx, sy);
@@ -894,7 +897,8 @@ window_pane_alternate_on(struct window_pane *wp, struct grid_cell *gc)
 
 /* Exit alternate screen mode and restore the copied grid. */
 void
-window_pane_alternate_off(struct window_pane *wp, struct grid_cell *gc)
+window_pane_alternate_off(struct window_pane *wp, struct grid_cell *gc,
+    int cursor)
 {
 	struct screen	*s = &wp->base;
 	u_int		 sx, sy;
@@ -915,10 +919,12 @@ window_pane_alternate_off(struct window_pane *wp, struct grid_cell *gc)
 
 	/* Restore the grid, cursor position and cell. */
 	grid_duplicate_lines(s->grid, screen_hsize(s), wp->saved_grid, 0, sy);
-	s->cx = wp->saved_cx;
+	if (cursor)
+		s->cx = wp->saved_cx;
 	if (s->cx > screen_size_x(s) - 1)
 		s->cx = screen_size_x(s) - 1;
-	s->cy = wp->saved_cy;
+	if (cursor)
+		s->cy = wp->saved_cy;
 	if (s->cy > screen_size_y(s) - 1)
 		s->cy = screen_size_y(s) - 1;
 	memcpy(gc, &wp->saved_cell, sizeof *gc);