From 3c3c08b6d9704b00a12e14772b95f7a40c20b10e Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Wed, 15 Mar 2017 09:21:21 +0000
Subject: [PATCH] Try to avoid moving the cursor to the start of the next line
 when printing cells if it is already at the very end of the line and the
 terminal will wrap it to the next line itself, this means terminals still see
 it as a wrapped line for the purposes of their own mouse selection. Reported
 by millert@.

---
 tty.c | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/tty.c b/tty.c
index 0ed6125e..47b28454 100644
--- a/tty.c
+++ b/tty.c
@@ -41,6 +41,8 @@ static int	tty_try_colour(struct tty *, int, const char *);
 static void	tty_force_cursor_colour(struct tty *, const char *);
 static void	tty_cursor_pane(struct tty *, const struct tty_ctx *, u_int,
 		    u_int);
+static void	tty_cursor_pane_unless_wrap(struct tty *,
+		    const struct tty_ctx *, u_int, u_int);
 static void	tty_invalidate(struct tty *);
 static void	tty_colours(struct tty *, const struct grid_cell *);
 static void	tty_check_fg(struct tty *, const struct window_pane *,
@@ -1188,7 +1190,7 @@ tty_cmd_cell(struct tty *tty, const struct tty_ctx *ctx)
 			tty_margin_off(tty);
 	}
 
-	tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
+	tty_cursor_pane_unless_wrap(tty, ctx, ctx->ocx, ctx->ocy);
 
 	tty_cell(tty, ctx->cell, ctx->wp);
 }
@@ -1196,7 +1198,7 @@ tty_cmd_cell(struct tty *tty, const struct tty_ctx *ctx)
 void
 tty_cmd_cells(struct tty *tty, const struct tty_ctx *ctx)
 {
-	tty_cursor_pane(tty, ctx, ctx->ocx, ctx->ocy);
+	tty_cursor_pane_unless_wrap(tty, ctx, ctx->ocx, ctx->ocy);
 
 	tty_attributes(tty, ctx->cell, ctx->wp);
 	tty_putn(tty, ctx->ptr, ctx->num, ctx->num);
@@ -1389,6 +1391,24 @@ tty_margin(struct tty *tty, u_int rleft, u_int rright)
 	tty->cx = tty->cy = UINT_MAX;
 }
 
+/*
+ * Move the cursor, unless it would wrap itself when the next character is
+ * printed.
+ */
+static void
+tty_cursor_pane_unless_wrap(struct tty *tty, const struct tty_ctx *ctx,
+    u_int cx, u_int cy)
+{
+	if (!tty_pane_full_width(tty, ctx) ||
+	    (tty->term->flags & TERM_EARLYWRAP) ||
+	    ctx->xoff + cx != 0 ||
+	    ctx->yoff + cy != tty->cy + 1 ||
+	    tty->cx < tty->sx)
+		tty_cursor_pane(tty, ctx, cx, cy);
+	else
+		log_debug("%s: will wrap at %u,%u", __func__, tty->cx, tty->cy);
+}
+
 /* Move cursor inside pane. */
 static void
 tty_cursor_pane(struct tty *tty, const struct tty_ctx *ctx, u_int cx, u_int cy)