===================================================================
RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/tmux/tty.c,v
retrieving revision 1.45
retrieving revision 1.46
diff -u -r1.45 -r1.46
--- src/usr.bin/tmux/tty.c	2009/10/12 16:41:02	1.45
+++ src/usr.bin/tmux/tty.c	2009/10/12 17:19:47	1.46
@@ -1,4 +1,4 @@
-/* $OpenBSD: tty.c,v 1.45 2009/10/12 16:41:02 nicm Exp $ */
+/* $OpenBSD: tty.c,v 1.46 2009/10/12 17:19:47 nicm Exp $ */
 
 /*
  * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
@@ -327,9 +327,10 @@
 		if (tty->term->flags & TERM_EARLYWRAP)
 			sx--;
 
-		if (tty->cx == sx) {
-			tty->cx = 0;
-			tty->cy++;
+		if (tty->cx >= sx) {
+			tty->cx = 1;
+			if (tty->cy != tty->rlower)
+				tty->cy++;
 		} else
 			tty->cx++;
 	}
@@ -440,6 +441,7 @@
 tty_draw_line(struct tty *tty, struct screen *s, u_int py, u_int ox, u_int oy)
 {
 	const struct grid_cell	*gc;
+	struct grid_line	*gl;
 	struct grid_cell	 tmpgc;
 	const struct grid_utf8	*gu;
 	u_int			 i, sx;
@@ -452,7 +454,17 @@
 	if (sx > tty->sx)
 		sx = tty->sx;
 
-	tty_cursor(tty, ox, oy + py);
+	/*
+	 * Don't move the cursor to the start permission if it will wrap there
+	 * itself; much the same as the conditions in tty_cmd_cell.
+	 */
+	gl = NULL;
+	if (py != 0)
+		gl = &s->grid->linedata[s->grid->hsize + py - 1];
+	if (ox != 0 || (gl != NULL && !(gl->flags & GRID_LINE_WRAPPED)) ||
+	    tty->cy != oy + py - 1 || tty->cx < tty->sx)
+		tty_cursor(tty, ox, oy + py);
+
 	for (i = 0; i < sx; i++) {
 		gc = grid_view_peek_cell(s->grid, i, py);
 
@@ -827,7 +839,36 @@
 void
 tty_cmd_cell(struct tty *tty, const struct tty_ctx *ctx)
 {
-	tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
+	struct window_pane	*wp = ctx->wp;
+	struct screen		*s = wp->screen;
+	struct grid_line	*gl;
+	u_int			 wx, wy;
+
+	tty_region_pane(tty, ctx, ctx->orupper, ctx->orlower);
+
+	wx = ctx->ocx + wp->xoff;
+	wy = ctx->ocy + wp->yoff;
+
+	/*
+	 * If:
+	 * 
+	 * - the line was wrapped:
+	 * - the cursor is beyond the edge of the screen,
+	 * - the desired position is at the left,
+	 * - and either a) the desired next line is the one below the current
+	 *   or b) the current line is the bottom of the scroll region,
+	 *
+	 * Then just printing the next character will be enough to scroll into
+	 * place, so don't do an explicit cursor move.
+	 */
+	gl = NULL;
+	if (ctx->ocy != 0)
+		gl = &s->grid->linedata[s->grid->hsize + ctx->ocy - 1];
+	if (wy == 0 || (gl != NULL && !(gl->flags & GRID_LINE_WRAPPED)) ||
+	    tty->cx < tty->sx ||	/* not at edge of screen */
+	    wx != 0 ||			/* don't want 0 next */
+	    (wy != tty->cy + 1 && tty->cy != ctx->orlower + wp->yoff))
+		tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
 
 	tty_cell(tty, ctx->cell, ctx->utf8);
 }