diff --git a/decorations/decoratedclient.cpp b/decorations/decoratedclient.cpp
index 92fe7b5f17..6e150d8043 100644
--- a/decorations/decoratedclient.cpp
+++ b/decorations/decoratedclient.cpp
@@ -67,6 +67,7 @@ DecoratedClientImpl::DecoratedClientImpl(AbstractClient *client, KDecoration2::D
             if (oldSize.height() != m_clientSize.height()) {
                 emit decoratedClient->heightChanged(m_clientSize.height());
             }
+            emit decoratedClient->sizeChanged(m_clientSize);
         }
     );
     connect(client, &AbstractClient::desktopChanged, this,
@@ -273,6 +274,11 @@ int DecoratedClientImpl::height() const
     return m_clientSize.height();
 }
 
+QSize DecoratedClientImpl::size() const
+{
+    return m_clientSize;
+}
+
 bool DecoratedClientImpl::isMaximizedVertically() const
 {
     return m_client->requestedMaximizeMode() & MaximizeVertical;
diff --git a/decorations/decoratedclient.h b/decorations/decoratedclient.h
index 735748a6c4..576b62c3c4 100644
--- a/decorations/decoratedclient.h
+++ b/decorations/decoratedclient.h
@@ -66,6 +66,7 @@ public:
     QPalette palette() const override;
     QColor color(KDecoration2::ColorGroup group, KDecoration2::ColorRole role) const override;
     bool providesContextHelp() const override;
+    QSize size() const override;
     int width() const override;
     WId windowId() const override;
 
diff --git a/decorations/decorationrenderer.cpp b/decorations/decorationrenderer.cpp
index ef753f27c4..5e28e40b71 100644
--- a/decorations/decorationrenderer.cpp
+++ b/decorations/decorationrenderer.cpp
@@ -40,12 +40,12 @@ Renderer::Renderer(DecoratedClientImpl *client)
     , m_imageSizesDirty(true)
 {
     auto markImageSizesDirty = [this]{
+        schedule(m_client->client()->rect());
         m_imageSizesDirty = true;
     };
     connect(client->client(), &AbstractClient::screenScaleChanged, this, markImageSizesDirty);
     connect(client->decoration(), &KDecoration2::Decoration::bordersChanged, this, markImageSizesDirty);
-    connect(client->decoratedClient(), &KDecoration2::DecoratedClient::widthChanged, this, markImageSizesDirty);
-    connect(client->decoratedClient(), &KDecoration2::DecoratedClient::heightChanged, this, markImageSizesDirty);
+    connect(client->decoratedClient(), &KDecoration2::DecoratedClient::sizeChanged, this, markImageSizesDirty);
 }
 
 Renderer::~Renderer() = default;
diff --git a/kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp b/kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp
index 852d326d09..8319ccb9ae 100644
--- a/kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp
+++ b/kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp
@@ -111,6 +111,11 @@ PreviewClient::PreviewClient(DecoratedClient *c, Decoration *decoration)
     connect(this, &PreviewClient::bordersLeftEdgeChanged,   this, emitEdgesChanged);
     connect(this, &PreviewClient::bordersRightEdgeChanged,  this, emitEdgesChanged);
     connect(this, &PreviewClient::bordersBottomEdgeChanged, this, emitEdgesChanged);
+    auto emitSizeChanged = [this, c]() {
+        emit c->sizeChanged(c->size());
+    };
+    connect(this, &PreviewClient::widthChanged, this, emitSizeChanged);
+    connect(this, &PreviewClient::heightChanged, this, emitSizeChanged);
 
     qApp->installEventFilter(this);
 }
@@ -133,6 +138,11 @@ int PreviewClient::height() const
     return m_height;
 }
 
+QSize PreviewClient::size() const
+{
+    return QSize(m_width, m_height);
+}
+
 QString PreviewClient::caption() const
 {
     return m_caption;
diff --git a/kcmkwin/kwindecoration/declarative-plugin/previewclient.h b/kcmkwin/kwindecoration/declarative-plugin/previewclient.h
index ced66cadef..c37db74854 100644
--- a/kcmkwin/kwindecoration/declarative-plugin/previewclient.h
+++ b/kcmkwin/kwindecoration/declarative-plugin/previewclient.h
@@ -90,6 +90,7 @@ public:
 
     int width() const override;
     int height() const override;
+    QSize size() const override;
     QPalette palette() const override;
     QColor color(ColorGroup group, ColorRole role) const override;
     Qt::Edges adjacentScreenEdges() const override;
diff --git a/plugins/scenes/opengl/scene_opengl.cpp b/plugins/scenes/opengl/scene_opengl.cpp
index 3b5d2432d0..d15e503174 100644
--- a/plugins/scenes/opengl/scene_opengl.cpp
+++ b/plugins/scenes/opengl/scene_opengl.cpp
@@ -2562,11 +2562,10 @@ static void clamp(QImage &image, const QRect &viewport)
 void SceneOpenGLDecorationRenderer::render()
 {
     const QRegion scheduled = getScheduled();
-    const bool dirty = areImageSizesDirty();
-    if (scheduled.isEmpty() && !dirty) {
+    if (scheduled.isEmpty()) {
         return;
     }
-    if (dirty) {
+    if (areImageSizesDirty()) {
         resizeTexture();
         resetImageSizesDirty();
     }
@@ -2579,8 +2578,6 @@ void SceneOpenGLDecorationRenderer::render()
     QRect left, top, right, bottom;
     client()->client()->layoutDecorationRects(left, top, right, bottom);
 
-    const QRect geometry = dirty ? QRect(QPoint(0, 0), client()->client()->size()) : scheduled.boundingRect();
-
     // We pad each part in the decoration atlas in order to avoid texture bleeding.
     const int padding = 1;
 
@@ -2634,6 +2631,8 @@ void SceneOpenGLDecorationRenderer::render()
         m_texture->update(image, (position + dirtyOffset - viewport.topLeft()) * image.devicePixelRatio());
     };
 
+    const QRect geometry = scheduled.boundingRect();
+
     const QPoint topPosition(padding, padding);
     const QPoint bottomPosition(padding, topPosition.y() + top.height() + 2 * padding);
     const QPoint leftPosition(padding, bottomPosition.y() + bottom.height() + 2 * padding);
diff --git a/plugins/scenes/xrender/scene_xrender.cpp b/plugins/scenes/xrender/scene_xrender.cpp
index 1afeeedcb2..acab174a56 100644
--- a/plugins/scenes/xrender/scene_xrender.cpp
+++ b/plugins/scenes/xrender/scene_xrender.cpp
@@ -1229,7 +1229,6 @@ void SceneXRenderDecorationRenderer::render()
     if (areImageSizesDirty()) {
         resizePixmaps();
         resetImageSizesDirty();
-        scheduled = client()->client()->decorationRect();
     }
 
     const QRect top(QPoint(0, 0), m_sizes[int(DecorationPart::Top)]);