From 0204b77766b1166e0bda8542a57be625760844c1 Mon Sep 17 00:00:00 2001
From: WandererFan <wandererfan@gmail.com>
Date: Fri, 6 Jan 2017 09:36:03 -0500
Subject: [PATCH] Warn if Anchor view deleted in Projection Group

---
 src/Mod/TechDraw/App/DrawProjGroup.cpp     |  5 +++++
 src/Mod/TechDraw/App/DrawProjGroupItem.cpp | 13 +++++++++++++
 src/Mod/TechDraw/App/DrawProjGroupItem.h   |  6 +-----
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/src/Mod/TechDraw/App/DrawProjGroup.cpp b/src/Mod/TechDraw/App/DrawProjGroup.cpp
index a3da8149f..926a449b8 100644
--- a/src/Mod/TechDraw/App/DrawProjGroup.cpp
+++ b/src/Mod/TechDraw/App/DrawProjGroup.cpp
@@ -496,6 +496,11 @@ int DrawProjGroup::removeProjection(const char *viewProjType)
             auto projPtr( dynamic_cast<TechDraw::DrawProjGroupItem *>(it) );
             if( projPtr ) {
                 if ( strcmp(viewProjType, projPtr->Type.getValueAsString()) == 0 ) {
+                    if( strcmp(viewProjType,"Front") == 0 ) {
+                        Base::Console().Warning("DPG - %s: Front projection deleted. Projection group may be corrupt\n",
+                                                 getNameInDocument());
+                        Anchor.setValue(nullptr);
+                    }
                     removeView(projPtr);                                        // Remove from collection
                     getDocument()->remObject( it->getNameInDocument() );        // Remove from the document
                     moveToCentre();
diff --git a/src/Mod/TechDraw/App/DrawProjGroupItem.cpp b/src/Mod/TechDraw/App/DrawProjGroupItem.cpp
index 1e9cf5e5c..f772c09f1 100644
--- a/src/Mod/TechDraw/App/DrawProjGroupItem.cpp
+++ b/src/Mod/TechDraw/App/DrawProjGroupItem.cpp
@@ -160,6 +160,19 @@ double DrawProjGroupItem::getRotateAngle()
     return angle;
 }
 
+void DrawProjGroupItem::unsetupObject()
+{
+    if (getGroup() != nullptr) {
+        if (getGroup()->hasProjection(Type.getValueAsString()) ) {
+            if (getGroup()->getAnchor() == this) {
+                   Base::Console().Warning("Warning - DPG (%s/%s) may be corrupt - Anchor deleted\n",
+                                           getGroup()->getNameInDocument(),getGroup()->Label.getValue());
+                   getGroup()->Anchor.setValue(nullptr);
+             }
+        }
+    }
+}
+
 PyObject *DrawProjGroupItem::getPyObject(void)
 {
     if (PythonObject.is(Py::_None())) {
diff --git a/src/Mod/TechDraw/App/DrawProjGroupItem.h b/src/Mod/TechDraw/App/DrawProjGroupItem.h
index ac831f82a..8916594dd 100644
--- a/src/Mod/TechDraw/App/DrawProjGroupItem.h
+++ b/src/Mod/TechDraw/App/DrawProjGroupItem.h
@@ -59,12 +59,8 @@ public:
     App::PropertyVector      RotationVector;
 
     short mustExecute() const;
-    /** @name methods overide Feature */
-    //@{
-    /// recalculate the Feature
     virtual void onDocumentRestored();
-//    virtual App::DocumentObjectExecReturn *execute(void);  // TODO: Delete me too if we take out the implementation
-    //@}
+    virtual void unsetupObject();
 
     DrawProjGroup* getGroup(void) const;
     double getRotateAngle();