From 37ba18a8c32b43c73dbb8fda6c0ee2abfc5c7ba8 Mon Sep 17 00:00:00 2001
From: YuSanka <yusanka@gmail.com>
Date: Thu, 12 Aug 2021 12:39:52 +0200
Subject: [PATCH] DoubleSlider: Init extruder sequence in respect to the
 extruders count

---
 src/slic3r/GUI/DoubleSlider.cpp | 4 ++++
 src/slic3r/GUI/DoubleSlider.hpp | 7 +++++++
 2 files changed, 11 insertions(+)

diff --git a/src/slic3r/GUI/DoubleSlider.cpp b/src/slic3r/GUI/DoubleSlider.cpp
index 94d6a2c647..36a4f6e5cf 100644
--- a/src/slic3r/GUI/DoubleSlider.cpp
+++ b/src/slic3r/GUI/DoubleSlider.cpp
@@ -384,6 +384,10 @@ void Control::SetTicksValues(const Info& custom_gcode_per_print_z)
         // Switch to the "Feature type"/"Tool" from the very beginning of a new object slicing after deleting of the old one
         post_ticks_changed_event();
 
+    // init extruder sequence in respect to the extruders count 
+    if (m_ticks.empty())
+        m_extruders_sequence.init(m_extruder_colors.size());
+
     if (custom_gcode_per_print_z.mode && !custom_gcode_per_print_z.gcodes.empty())
         m_ticks.mode = custom_gcode_per_print_z.mode;
 
diff --git a/src/slic3r/GUI/DoubleSlider.hpp b/src/slic3r/GUI/DoubleSlider.hpp
index 601cbc7088..0f663f6630 100644
--- a/src/slic3r/GUI/DoubleSlider.hpp
+++ b/src/slic3r/GUI/DoubleSlider.hpp
@@ -180,6 +180,13 @@ struct ExtrudersSequence
             return;// last item can't be deleted
         extruders.erase(extruders.begin() + pos);
     }
+
+    void init(size_t extruders_count) 
+    {
+        extruders.clear();
+        for (size_t extruder = 0; extruder < extruders_count; extruder++)
+            extruders.push_back(extruder);
+    }
 };
 
 class Control : public wxControl