rm obsolete code

GUI/Model/Sample/ParticleItem.cpp

@@ -88,13 +88,3 @@ bool ParticleItem::isShellParticle() const
     return parent()->hasModelType<ParticleCoreShellItem>()
            && ParticleCoreShellItem::isShellTagName(parent()->tagFromItem(this));
 }
-
-//! Returns true if this particle is directly connected to a ParticleLayout
-
-bool ParticleItem::parentIsParticleLayout() const
-{
-    if (!parent())
-        return false;
-
-    return parent()->hasModelType<ParticleLayoutItem>();
-}

GUI/Model/Sample/ParticleItem.h

@@ -42,7 +42,6 @@ public:
 
 private:
     bool isShellParticle() const override;
-    bool parentIsParticleLayout() const;
 };
 
 template <typename T> T* ParticleItem::setFormFactorType()