diff --git a/autotests/integration/xdgshellclient_test.cpp b/autotests/integration/xdgshellclient_test.cpp
index 3ab8428563..3f8e17d663 100644
--- a/autotests/integration/xdgshellclient_test.cpp
+++ b/autotests/integration/xdgshellclient_test.cpp
@@ -99,11 +99,72 @@ private Q_SLOTS:
     void testXdgWindowGeometryInteractiveResize();
     void testXdgWindowGeometryFullScreen();
     void testXdgWindowGeometryMaximize();
+    void testXdgWindowReactive();
+    void testXdgWindowRepositioning();
     void testPointerInputTransform();
     void testReentrantSetFrameGeometry();
     void testDoubleMaximize();
 };
 
+void TestXdgShellClient::testXdgWindowReactive()
+{
+    QScopedPointer<Test::XdgPositioner> positioner(Test::createXdgPositioner());
+    positioner->set_size(10, 10);
+    positioner->set_anchor_rect(10, 10, 10, 10);
+    positioner->set_reactive();
+
+    QScopedPointer<Surface> rootSurface(Test::createSurface());
+    QScopedPointer<Surface> childSurface(Test::createSurface());
+
+    QScopedPointer<Test::XdgToplevel> root(Test::createXdgToplevelSurface(rootSurface.data()));
+    QScopedPointer<Test::XdgPopup> popup(Test::createXdgPopupSurface(childSurface.data(), root->xdgSurface(), positioner.data()));
+
+    auto rootClient = Test::renderAndWaitForShown(rootSurface.data(), QSize(100, 100), Qt::cyan);
+    auto childClient = Test::renderAndWaitForShown(childSurface.data(), QSize(10, 10), Qt::cyan);
+
+    QVERIFY(rootClient);
+    QVERIFY(childClient);
+
+    QSignalSpy frameGeometryChangedSpy(childClient, &AbstractClient::frameGeometryChanged);
+    QVERIFY(frameGeometryChangedSpy.isValid());
+
+    rootClient->move(rootClient->x()+20, rootClient->y()+20);
+
+    QVERIFY(frameGeometryChangedSpy.wait());
+    QCOMPARE(frameGeometryChangedSpy.count(), 1);
+}
+
+void TestXdgShellClient::testXdgWindowRepositioning()
+{
+    QScopedPointer<Test::XdgPositioner> positioner(Test::createXdgPositioner());
+    positioner->set_size(10, 10);
+    positioner->set_anchor_rect(10, 10, 10, 10);
+
+    QScopedPointer<Test::XdgPositioner> otherPositioner(Test::createXdgPositioner());
+    otherPositioner->set_size(50, 50);
+    otherPositioner->set_anchor_rect(10, 10, 10, 10);
+
+    QScopedPointer<Surface> rootSurface(Test::createSurface());
+    QScopedPointer<Surface> childSurface(Test::createSurface());
+
+    QScopedPointer<Test::XdgToplevel> root(Test::createXdgToplevelSurface(rootSurface.data()));
+    QScopedPointer<Test::XdgPopup> popup(Test::createXdgPopupSurface(childSurface.data(), root->xdgSurface(), positioner.data()));
+
+    auto rootClient = Test::renderAndWaitForShown(rootSurface.data(), QSize(100, 100), Qt::cyan);
+    auto childClient = Test::renderAndWaitForShown(childSurface.data(), QSize(10, 10), Qt::cyan);
+
+    QVERIFY(rootClient);
+    QVERIFY(childClient);
+
+    QSignalSpy reconfigureSpy(popup.data(), &Test::XdgPopup::configureRequested);
+    QVERIFY(reconfigureSpy.isValid());
+
+    popup->reposition(otherPositioner->object(), 500000);
+
+    QVERIFY(reconfigureSpy.wait());
+    QCOMPARE(reconfigureSpy.count(), 1);
+}
+
 void TestXdgShellClient::initTestCase()
 {
     qRegisterMetaType<KWin::Deleted*>();
diff --git a/xdgshellclient.cpp b/xdgshellclient.cpp
index 3fcfed4662..99e0486195 100644
--- a/xdgshellclient.cpp
+++ b/xdgshellclient.cpp
@@ -1705,10 +1705,37 @@ XdgPopupClient::XdgPopupClient(XdgPopupInterface *shellSurface)
             this, &XdgPopupClient::handleGrabRequested);
     connect(shellSurface, &XdgPopupInterface::initializeRequested,
             this, &XdgPopupClient::initialize);
+    connect(shellSurface, &XdgPopupInterface::repositionRequested,
+            this, &XdgPopupClient::handleRepositionRequested);
     connect(shellSurface, &XdgPopupInterface::destroyed,
             this, &XdgPopupClient::destroyClient);
 }
 
+void XdgPopupClient::handlePositionerBindings()
+{
+    if (m_shellSurface->positioner().isReactive()) {
+        connect(transientFor(), &AbstractClient::frameGeometryChanged,
+                this, &XdgPopupClient::relayout, Qt::UniqueConnection);
+    } else {
+        disconnect(transientFor(), &AbstractClient::frameGeometryChanged,
+                   this, &XdgPopupClient::relayout);
+    }
+}
+
+void XdgPopupClient::handleRepositionRequested(quint32 token)
+{
+    handlePositionerBindings();
+    m_shellSurface->sendRepositioned(token);
+    relayout();
+}
+
+void XdgPopupClient::relayout()
+{
+    GeometryUpdatesBlocker blocker(this);
+    Placement::self()->place(this, QRect());
+    scheduleConfigure(ConfigureRequired);
+}
+
 XdgPopupClient::~XdgPopupClient()
 {
 }
diff --git a/xdgshellclient.h b/xdgshellclient.h
index eeed71f6c8..35360917cf 100644
--- a/xdgshellclient.h
+++ b/xdgshellclient.h
@@ -249,7 +249,10 @@ protected:
 
 private:
     void handleGrabRequested(KWaylandServer::SeatInterface *seat, quint32 serial);
+    void handlePositionerBindings();
+    void handleRepositionRequested(quint32 token);
     void initialize();
+    void relayout();
 
     KWaylandServer::XdgPopupInterface *m_shellSurface;
     bool m_haveExplicitGrab = false;