From 8e28ca6f4a86410e6ed0093899d6b857ad5c7035 Mon Sep 17 00:00:00 2001
From: Vojtech Bubnik <bubnikv@gmail.com>
Date: Fri, 13 Aug 2021 10:52:44 +0200
Subject: [PATCH] Fixed reading of configuration from 3MF broken with
 e947a29fc88f098febd2d93a8d9acf8ccedd4229

---
 src/libslic3r/Config.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/libslic3r/Config.cpp b/src/libslic3r/Config.cpp
index 41ee9231f..b7facbe0e 100644
--- a/src/libslic3r/Config.cpp
+++ b/src/libslic3r/Config.cpp
@@ -659,8 +659,9 @@ ConfigSubstitutions ConfigBase::load_from_ini_string_commented(std::string &&dat
                 // Consume LF.
                 assert(data[i] == '\n');
                 // Don't keep empty lines.
-                if (j != 0 && data[j] != '\n')
-                    data[j ++] = data[i ++];
+                if (j > 0 && data[j - 1] != '\n')
+                    data[j ++] = data[i];
+                ++ i;
             }
             // Skip all leading spaces;
             for (; i < data.size() && (data[i] == ' ' || data[i] == '\t'); ++ i) ;