Fix #3698 Detail of Section View

src/Mod/TechDraw/App/DrawViewDetail.cpp

@@ -84,6 +84,7 @@
 #include "DrawUtil.h"
 #include "DrawViewDetail.h"
 #include "DrawProjGroupItem.h"
+#include "DrawViewSection.h"
 
 using namespace TechDraw;
 using namespace std;
@@ -172,7 +173,18 @@ App::DocumentObjectExecReturn *DrawViewDetail::execute(void)
         dpgi= static_cast<TechDraw::DrawProjGroupItem*>(dvp);
     }
 
-    TopoDS_Shape shape = dvp->getSourceShapeFused();
+    DrawViewSection* dvs = nullptr;
+    if (dvp->isDerivedFrom(TechDraw::DrawViewSection::getClassTypeId())) {
+        dvs= static_cast<TechDraw::DrawViewSection*>(dvp);
+    }
+
+    TopoDS_Shape shape;
+    if (dvs != nullptr) {
+        shape = dvs->getCutShape();
+    } else {
+        shape = dvp->getSourceShapeFused();
+    }
+
     if (shape.IsNull()) {
         return new App::DocumentObjectExecReturn("DVD - Linked shape object is invalid");
     }

src/Mod/TechDraw/App/DrawViewSection.cpp

@@ -250,6 +250,7 @@ App::DocumentObjectExecReturn *DrawViewSection::execute(void)
         return DrawView::execute();
     }
 
+    m_cutShape = rawShape;
     gp_Pnt inputCenter;
     try {
         inputCenter = TechDrawGeometry::findCentroid(rawShape,

src/Mod/TechDraw/App/DrawViewSection.h

@@ -30,6 +30,7 @@
 #include <App/FeaturePython.h>
 #include <App/Material.h>
 
+#include <TopoDS_Shape.hxx>
 #include <TopoDS_Compound.hxx>
 
 #include "DrawViewPart.h"
@@ -94,6 +95,8 @@ public:
     std::vector<LineSet> getDrawableLines(int i = 0);
     std::vector<PATLineSpec> getDecodedSpecsFromFile(std::string fileSpec, std::string myPattern);
 
+    TopoDS_Shape getCutShape(void) {return m_cutShape;}
+
     static const char* SectionDirEnums[];
 
 protected:
@@ -108,6 +111,7 @@ protected:
                                      gp_Pnt faceCenter,
                                      const Base::Vector3d &direction);
     void getParameters(void);
+    TopoDS_Shape m_cutShape;
 };
 
 typedef App::FeaturePythonT<DrawViewSection> DrawViewSectionPython;