[TD]fix 3d dimension position on DetailView

src/Mod/TechDraw/App/DimensionGeometry.cpp

@@ -32,6 +32,7 @@
 #include "DimensionGeometry.h"
 #include "DrawUtil.h"
 #include "DrawViewPart.h"
+#include "DrawViewDetail.h"
 
 
 using namespace TechDraw;
@@ -72,6 +73,14 @@ void pointPair::scale(double factor)
 // project the points onto the dvp's paper plane.
 void pointPair::project(const DrawViewPart* dvp)
 {
+    auto detailView = dynamic_cast<const DrawViewDetail*>(dvp);
+    if (detailView) {
+        m_first = detailView->mapPoint3dToDetail(m_first) * detailView->getScale();
+        m_second = detailView->mapPoint3dToDetail(m_second) * detailView->getScale();
+        m_overrideFirst = detailView->mapPoint3dToDetail(m_overrideFirst) * detailView->getScale();
+        m_overrideSecond = detailView->mapPoint3dToDetail(m_overrideSecond) * detailView->getScale();
+        return;
+    }
     m_first = dvp->projectPoint(m_first) * dvp->getScale();
     m_second = dvp->projectPoint(m_second) * dvp->getScale();
     m_overrideFirst = dvp->projectPoint(m_overrideFirst) * dvp->getScale();

src/Mod/TechDraw/App/DrawViewDetail.cpp

@@ -437,6 +437,20 @@ TopoDS_Shape DrawViewDetail::projectEdgesOntoFace(TopoDS_Shape& edgeShape, TopoD
     return TopoDS_Shape(std::move(edges));
 }
 
+//! given a 3d point, find the corresponding point in this view.
+Base::Vector3d DrawViewDetail::mapPoint3dToDetail(const Base::Vector3d& inPoint) const
+{
+    auto baseObj = BaseView.getValue();
+    auto baseDvp = dynamic_cast<DrawViewPart*>(baseObj);
+    if (!baseDvp) {
+        throw Base::RuntimeError("Detail has no BaseView");
+    }
+    auto pointOnBase = baseDvp->projectPoint(inPoint, false);
+    auto detailCenter = AnchorPoint.getValue();
+    auto pointOnDetail = DU::invertY(pointOnBase - detailCenter);
+    return pointOnDetail;
+}
+
 //we don't want to paint detail highlights on top of detail views,
 //so tell the Gui that there are no details for this view
 std::vector<DrawViewDetail*> DrawViewDetail::getDetailRefs() const

src/Mod/TechDraw/App/DrawViewDetail.h

@@ -92,6 +92,8 @@ public:
     std::vector<DrawViewDetail*> getDetailRefs() const override;
     TopoDS_Shape getDetailShape() const { return m_detailShape; }
 
+    Base::Vector3d mapPoint3dToDetail(const Base::Vector3d& inPoint) const;
+
 public Q_SLOTS:
     void onMakeDetailFinished(void);