PD: fixes #6451: Face color of PartDesign Body not exported to STEP

src/Mod/PartDesign/App/Body.cpp

@@ -529,6 +529,11 @@ void Body::onDocumentRestored()
             static_cast<PartDesign::Feature*>(obj)->_Body.setValue(this);
     }
     _GroupTouched.setStatus(App::Property::Output,true);
+
+    // trigger ViewProviderBody::copyColorsfromTip
+    if (Tip.getValue())
+        Tip.touch();
+
     DocumentObject::onDocumentRestored();
 }
 

src/Mod/PartDesign/Gui/ViewProviderBody.cpp

@@ -227,11 +227,22 @@ void ViewProviderBody::updateData(const App::Property* prop)
                 static_cast<PartDesignGui::ViewProvider*>(vp)->setTipIcon(feature == tip);
             }
         }
+
+        if (tip)
+            copyColorsfromTip(tip);
     }
 
     PartGui::ViewProviderPart::updateData(prop);
 }
 
+void ViewProviderBody::copyColorsfromTip(App::DocumentObject* tip) {
+    // update DiffuseColor
+    Gui::ViewProvider* vptip = Gui::Application::Instance->getViewProvider(tip);
+    if (vptip && vptip->isDerivedFrom(PartGui::ViewProviderPartExt::getClassTypeId())) {
+        auto colors = static_cast<PartGui::ViewProviderPartExt*>(vptip)->DiffuseColor.getValues();
+        this->DiffuseColor.setValues(colors);
+    }
+}
 
 void ViewProviderBody::slotChangedObjectApp ( const App::DocumentObject& obj, const App::Property& prop ) {
 

src/Mod/PartDesign/Gui/ViewProviderBody.h

@@ -94,6 +94,10 @@ protected:
     void unifyVisualProperty(const App::Property* prop);
     /// Set Feature viewprovider into visual body mode
     void setVisualBodyMode(bool bodymode);
+
+private:
+    void copyColorsfromTip(App::DocumentObject* tip);
+
 private:
     static const char* BodyModeEnum[];