From 5ddcea806b6761c2ec153705d19294a1e682300c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Hejl?= <hejl.lukas@gmail.com>
Date: Tue, 9 Jan 2024 10:53:43 +0100
Subject: [PATCH] Add to GCodeGenerator::last_position only when it has an
 assigned value.

This behavior was there for a long time, but it was uncovered when std::optional was used.
---
 src/libslic3r/GCode.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 5f8e5df2b5..ff7b341807 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -2641,7 +2641,9 @@ void GCodeGenerator::set_origin(const Vec2d &pointf)
 {
     // if origin increases (goes towards right), last_pos decreases because it goes towards left
     const auto offset = Point::new_scale(m_origin - pointf);
-    *(this->last_position) += offset;
+    if (last_position.has_value())
+        *(this->last_position) += offset;
+
     m_wipe.offset_path(offset);
     m_origin = pointf;
 }