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From df40f2ea17254de269a3624319a12a93a4e395ff Mon Sep 17 00:00:00 2001
From: Andreas Gruenbacher <agruen@gnu.org>
Date: Fri, 17 Aug 2018 13:35:40 +0200
Subject: [PATCH] Fix swapping fake lines in pch_swap

* src/pch.c (pch_swap): Fix swapping p_bfake and p_efake when there is a
blank line in the middle of a context-diff hunk: that empty line stays
in the middle of the hunk and isn't swapped.

Fixes: https://savannah.gnu.org/bugs/index.php?53133
---
 src/pch.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/src/pch.c
+++ b/src/pch.c
@@ -2115,7 +2115,7 @@ pch_swap (void)
     }
     if (p_efake >= 0) {                        /* fix non-freeable ptr range */
        if (p_efake <= i)
-           n = p_end - i + 1;
+           n = p_end - p_ptrn_lines;
        else
            n = -i;
        p_efake += n;