From 20f132e09a7e7116b32d8e4435825c5e54652110 Mon Sep 17 00:00:00 2001
From: enricoturri1966 <enricoturri@seznam.cz>
Date: Tue, 30 May 2023 02:51:01 -0400
Subject: [PATCH] SPE-1739: Fixed calculation of gcode preview sequential
 slider endpoints

(cherry picked from commit 578921257d14e2c07611dfbb89cda5f9dc776e0c)
---
 src/libslic3r/GCode.cpp                | 1 +
 src/libslic3r/GCode/GCodeProcessor.cpp | 5 +----
 src/libslic3r/GCode/GCodeProcessor.hpp | 5 +++++
 3 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index 4d4dd63e63..a5c36d0a8f 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -1609,6 +1609,7 @@ namespace DoExport {
         silent_time_estimator_enabled = (config.gcode_flavor == gcfMarlinLegacy || config.gcode_flavor == gcfMarlinFirmware)
                                         && config.silent_mode;
         processor.reset();
+        processor.initialize_result_moves();
         processor.apply_config(config);
         processor.enable_stealth_time_estimator(silent_time_estimator_enabled);
     }
diff --git a/src/libslic3r/GCode/GCodeProcessor.cpp b/src/libslic3r/GCode/GCodeProcessor.cpp
index 36da3764c1..0f23d6f058 100644
--- a/src/libslic3r/GCode/GCodeProcessor.cpp
+++ b/src/libslic3r/GCode/GCodeProcessor.cpp
@@ -1288,8 +1288,7 @@ void GCodeProcessor::process_file(const std::string& filename, std::function<voi
     // process gcode
     m_result.filename = filename;
     m_result.id = ++s_result_id;
-    // 1st move must be a dummy move
-    m_result.moves.emplace_back(GCodeProcessorResult::MoveVertex());
+    initialize_result_moves();
     size_t parse_line_callback_cntr = 10000;
     m_parser.parse_file(filename, [this, cancel_callback, &parse_line_callback_cntr](GCodeReader& reader, const GCodeReader::GCodeLine& line) {
         if (-- parse_line_callback_cntr == 0) {
@@ -1312,8 +1311,6 @@ void GCodeProcessor::initialize(const std::string& filename)
     // process gcode
     m_result.filename = filename;
     m_result.id = ++s_result_id;
-    // 1st move must be a dummy move
-    m_result.moves.emplace_back(GCodeProcessorResult::MoveVertex());
 }
 
 void GCodeProcessor::process_buffer(const std::string &buffer)
diff --git a/src/libslic3r/GCode/GCodeProcessor.hpp b/src/libslic3r/GCode/GCodeProcessor.hpp
index d682762169..02d653ca2d 100644
--- a/src/libslic3r/GCode/GCodeProcessor.hpp
+++ b/src/libslic3r/GCode/GCodeProcessor.hpp
@@ -787,6 +787,11 @@ class Print;
 
         // Streaming interface, for processing G-codes just generated by PrusaSlicer in a pipelined fashion.
         void initialize(const std::string& filename);
+        void initialize_result_moves() {
+            // 1st move must be a dummy move
+            assert(m_result.moves.empty());
+            m_result.moves.emplace_back(GCodeProcessorResult::MoveVertex());
+        }
         void process_buffer(const std::string& buffer);
         void finalize(bool post_process);