[TechDraw] Unify Projection Group parent linking

src/Mod/TechDraw/App/DrawProjGroupItem.cpp

@@ -181,14 +181,7 @@ void DrawProjGroupItem::onDocumentRestored()
 
 DrawProjGroup* DrawProjGroupItem::getPGroup() const
 {
-    std::vector<App::DocumentObject*> parent = getInList();
-    for (std::vector<App::DocumentObject*>::iterator it = parent.begin(); it != parent.end(); ++it) {
-        if ((*it)->isDerivedFrom<DrawProjGroup>()) {
-            DrawProjGroup* result = dynamic_cast<TechDraw::DrawProjGroup *>(*it);
-            return result;
-        }
-    }
-    return nullptr;
+    return dynamic_cast<DrawProjGroup *>(getCollection());
 }
 
 bool DrawProjGroupItem::isAnchor(void) const

src/Mod/TechDraw/App/DrawView.cpp

@@ -409,10 +409,14 @@ DrawView *DrawView::claimParent() const
 {
     App::PropertyLink *ownerProp = const_cast<DrawView *>(this)->getOwnerProperty();
     if (ownerProp) {
-        return dynamic_cast<DrawView *>(ownerProp->getValue());
+        auto ownerView = dynamic_cast<DrawView *>(ownerProp->getValue());
+        if (ownerView) {
+            return ownerView;
+        }
     }
 
-    return nullptr;
+    // If there is no parent view we are aware of, return the view collection we may belong to
+    return getCollection();
 }
 
 DrawViewClip* DrawView::getClipGroup()
@@ -430,6 +434,19 @@ DrawViewClip* DrawView::getClipGroup()
     return nullptr;
 }
 
+DrawViewCollection *DrawView::getCollection() const
+{
+    std::vector<App::DocumentObject *> parents = getInList();
+    for (auto it = parents.begin(); it != parents.end(); ++it) {
+        auto parentCollection = dynamic_cast<DrawViewCollection *>(*it);
+        if (parentCollection) {
+            return parentCollection;
+        }
+    }
+
+    return nullptr;
+}
+
 double DrawView::autoScale() const
 {
     auto page = findParentPage();

src/Mod/TechDraw/App/DrawView.h

@@ -37,6 +37,7 @@ namespace TechDraw
 {
 
 class DrawPage;
+class DrawViewCollection;
 class DrawViewClip;
 class DrawLeaderLine;
 /*class CosmeticVertex;*/
@@ -74,6 +75,7 @@ public:
 
     bool isInClip();
     DrawViewClip* getClipGroup();
+    DrawViewCollection *getCollection() const;
 
     /// returns the type name of the ViewProvider
     const char* getViewProviderName() const override {