FIX: avoid collsion in by object mode

jira:STUDIO-11625

Signed-off-by: xun.zhang <xun.zhang@bambulab.com>
Change-Id: If5957a919af606934a34aa942f54dc4e7650a7f9
(cherry picked from commit 476c17819fe2e4fb7891b4b46865dde1a0057f33)

src/libslic3r/GCode.hpp

@@ -610,7 +610,7 @@ private:
 
     Print *m_print{nullptr};
 
-    std::set<const PrintObject*> m_printed_objects;
+    std::vector<const PrintObject*> m_printed_objects;
 
     // Processor
     GCodeProcessor m_processor;