1 files changed, 42 insertions, 0 deletions
diff --git a/oox/source/drawingml/diagram/diagram.cxx b/oox/source/drawingml/diagram/diagram.cxx
index c3c28a84db23..7460c52f1fed 100644
--- a/oox/source/drawingml/diagram/diagram.cxx
+++ b/oox/source/drawingml/diagram/diagram.cxx
@@ -138,6 +138,46 @@ static sal_Int32 calcDepth( const OUString& rNodeName,
     return 0;
 }
 
+static void sortChildrenByZOrder(const ShapePtr& pShape)
+{
+    std::vector<ShapePtr>& rChildren = pShape->getChildren();
+
+    // Offset the children from their default z-order stacking, if necessary.
+    for (size_t i = 0; i < rChildren.size(); ++i)
+        rChildren[i]->setZOrder(i);
+
+    for (size_t i = 0; i < rChildren.size(); ++i)
+    {
+        const ShapePtr& pChild = rChildren[i];
+        sal_Int32 nZOrderOff = pChild->getZOrderOff();
+        if (nZOrderOff <= 0)
+            continue;
+
+        // Increase my ZOrder by nZOrderOff.
+        pChild->setZOrder(pChild->getZOrder() + nZOrderOff);
+        pChild->setZOrderOff(0);
+
+        for (sal_Int32 j = 0; j < nZOrderOff; ++j)
+        {
+            size_t nIndex = i + j + 1;
+            if (nIndex >= rChildren.size())
+                break;
+
+            // Decrease the ZOrder of the next nZOrderOff elements by one.
+            const ShapePtr& pNext = rChildren[nIndex];
+            pNext->setZOrder(pNext->getZOrder() - 1);
+        }
+    }
+
+    // Now that the ZOrders are adjusted, sort the children.
+    std::sort(rChildren.begin(), rChildren.end(),
+              [](const ShapePtr& a, const ShapePtr& b) { return a->getZOrder() < b->getZOrder(); });
+
+    // Apply also for children.
+    for (auto& rChild : rChildren)
+        sortChildrenByZOrder(rChild);
+}
+
 void Diagram::build(  )
 {
     // build name-object maps
@@ -318,6 +358,8 @@ void Diagram::addTo( const ShapePtr & pParentShape )
         // layout shapes - now all shapes are created
         ShapeLayoutingVisitor aLayoutingVisitor;
         mpLayout->getNode()->accept(aLayoutingVisitor);
+
+        sortChildrenByZOrder(pParentShape);
     }
 
     ShapePtr pBackground(new Shape("com.sun.star.drawing.CustomShape"));