Add missing CloneReset to BeamSpan

* Fixes #4290
* Closes #4291
* Test-suite evaluated locally

Author: lpugin

include/vrv/beamspan.h

@@ -47,6 +47,11 @@ class BeamSpan : public ControlElement,
     std::string GetClassName() const override { return "beamSpan"; }
     ///@}
 
+    /**
+     * Overriding CloneReset() method to be called after copy / assignment calls.
+     */
+    void CloneReset() override;
+    
     /**
      * @name Getter to interfaces
      */

src/beamspan.cpp

@@ -63,6 +63,13 @@ void BeamSpan::Reset()
     this->ClearBeamSegments();
 }
 
+void BeamSpan::CloneReset()
+{
+    m_beamSegments.clear();
+
+    ControlElement::CloneReset();
+}
+
 void BeamSpan::InitBeamSegments()
 {
     // BeamSpan should have at least one segment to begin with