4 files changed, 14 insertions, 2 deletions
diff --git a/src/imports/layouts/qquicklayout.cpp b/src/imports/layouts/qquicklayout.cpp
index eb61eb687f..7d51ec3ca9 100644
--- a/src/imports/layouts/qquicklayout.cpp
+++ b/src/imports/layouts/qquicklayout.cpp
@@ -769,6 +769,12 @@ bool QQuickLayout::shouldIgnoreItem(QQuickItem *child, QQuickLayoutAttached *&in
     return ignoreItem;
 }
 
+void QQuickLayout::checkAnchors(QQuickItem *item) const
+{
+    if (QQuickItemPrivate::get(item)->_anchors)
+        qmlWarning(item) << "Detected anchors on an item that is part of a layout. This is undefined behavior.";
+}
+
 void QQuickLayout::itemChange(ItemChange change, const ItemChangeData &value)
 {
     if (change == ItemChildAddedChange) {
diff --git a/src/imports/layouts/qquicklayout_p.h b/src/imports/layouts/qquicklayout_p.h
index 1e9984e337..b31bffa290 100644
--- a/src/imports/layouts/qquicklayout_p.h
+++ b/src/imports/layouts/qquicklayout_p.h
@@ -91,6 +91,7 @@ public:
     static void effectiveSizeHints_helper(QQuickItem *item, QSizeF *cachedSizeHints, QQuickLayoutAttached **info, bool useFallbackToWidthOrHeight);
     static QLayoutPolicy::Policy effectiveSizePolicy_helper(QQuickItem *item, Qt::Orientation orientation, QQuickLayoutAttached *info);
     bool shouldIgnoreItem(QQuickItem *child, QQuickLayoutAttached *&info, QSizeF *sizeHints) const;
+    void checkAnchors(QQuickItem *item) const;
 
     void itemChange(ItemChange change, const ItemChangeData &value) override;
     void geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry)  override;
diff --git a/src/imports/layouts/qquicklinearlayout.cpp b/src/imports/layouts/qquicklinearlayout.cpp
index 4410723f3d..db983e06ba 100644
--- a/src/imports/layouts/qquicklinearlayout.cpp
+++ b/src/imports/layouts/qquicklinearlayout.cpp
@@ -652,6 +652,7 @@ void QQuickGridLayout::insertLayoutItems()
     QSizeF sizeHints[Qt::NSizeHints];
     const auto items = childItems();
     for (QQuickItem *child : items) {
+        checkAnchors(child);
         QQuickLayoutAttached *info = 0;
 
         // Will skip all items with effective maximum width/height == 0
@@ -826,6 +827,7 @@ void QQuickLinearLayout::insertLayoutItems()
     const auto items = childItems();
     for (QQuickItem *child : items) {
         Q_ASSERT(child);
+        checkAnchors(child);
         QQuickLayoutAttached *info = 0;
 
         // Will skip all items with effective maximum width/height == 0
diff --git a/src/imports/layouts/qquickstacklayout.cpp b/src/imports/layouts/qquickstacklayout.cpp
index 9a7ec71473..cf70856e14 100644
--- a/src/imports/layouts/qquickstacklayout.cpp
+++ b/src/imports/layouts/qquickstacklayout.cpp
@@ -288,8 +288,11 @@ void QQuickStackLayout::updateLayoutItems()
         d->count = count;
         emit countChanged();
     }
-    for (int i = 0; i < count; ++i)
-        itemAt(i)->setVisible(d->currentIndex == i);
+    for (int i = 0; i < count; ++i) {
+        QQuickItem *child = itemAt(i);
+        checkAnchors(child);
+        child->setVisible(d->currentIndex == i);
+    }
 
     invalidate();
 }