QoL: show transparent shell in gcode preview and truncate long gcode line caused by native Klipper commands

src/slic3r/GUI/3DScene.cpp

@@ -1,3 +1,4 @@
+#include "slic3r/GUI/3DScene.hpp"
 #include <GL/glew.h>
 
 #if ENABLE_SMOOTH_NORMALS
@@ -1615,6 +1616,16 @@ void GLVolumeCollection::update_colors_by_extruder(const DynamicPrintConfig *con
     }
 }
 
+void GLVolumeCollection::set_transparency(float alpha)
+{
+    for (GLVolume *volume : volumes) {
+        if (volume == nullptr || volume->is_modifier || volume->is_wipe_tower || (volume->volume_idx() < 0))
+            continue;
+
+        volume->color[3] = alpha;
+    }
+}
+
 std::vector<double> GLVolumeCollection::get_current_print_zs(bool active_only) const
 {
     // Collect layer top positions of all volumes.