From 4d8d70a846d813390ab5f806f433a28c4315ed7a Mon Sep 17 00:00:00 2001
From: Tiago Cunha <tcunha@gmx.com>
Date: Tue, 5 Jan 2010 23:54:53 +0000
Subject: [PATCH] Sync OpenBSD patchset 598:

Fix selection behaviour when the cursor is moved backwards (ie so the selection
start is after the end).
---
 screen.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/screen.c b/screen.c
index 58776548..338c00c5 100644
--- a/screen.c
+++ b/screen.c
@@ -1,4 +1,4 @@
-/* $Id: screen.c,v 1.97 2009-12-04 22:14:47 tcunha Exp $ */
+/* $Id: screen.c,v 1.98 2010-01-05 23:54:53 tcunha Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -233,11 +233,31 @@ screen_set_selection(struct screen *s,
 	struct screen_sel	*sel = &s->sel;
 
 	memcpy(&sel->cell, gc, sizeof sel->cell);
-
 	sel->flag = 1;
-	if (ey < sy || (sy == ey && ex < sx)) {
+
+	/* starting line < ending line -- downward selection. */
+	if (sy < ey) {
+		sel->sx = sx; sel->sy = sy;
+		sel->ex = ex; sel->ey = ey;
+		return;
+	}
+
+	/* starting line > ending line -- upward selection. */
+	if (sy > ey) {
+		if (sx > 0) {
+			sel->sx = ex; sel->sy = ey;
+			sel->ex = sx - 1; sel->ey = sy;
+		} else {
+			sel->sx = ex; sel->sy = ey;
+			sel->ex = -1; sel->ey = sy - 1;
+		}
+		return;
+	}
+
+	/* starting line == ending line. */
+	if (ex < sx) {
 		sel->sx = ex; sel->sy = ey;
-		sel->ex = sx; sel->ey = sy;
+		sel->ex = sx - 1; sel->ey = sy;
 	} else {
 		sel->sx = sx; sel->sy = sy;
 		sel->ex = ex; sel->ey = ey;