diff --git a/effects/glide/glide.cpp b/effects/glide/glide.cpp
--- a/effects/glide/glide.cpp
+++ b/effects/glide/glide.cpp
@@ -313,7 +313,7 @@
         return true;
     }
 
-    if (!w->isManaged()) {
+    if (w->isPopupWindow()) {
         return false;
     }
 
diff --git a/effects/scale/scale.cpp b/effects/scale/scale.cpp
--- a/effects/scale/scale.cpp
+++ b/effects/scale/scale.cpp
@@ -274,7 +274,7 @@
         return true;
     }
 
-    if (!w->isManaged()) {
+    if (w->isPopupWindow()) {
         return false;
     }
 
diff --git a/libkwineffects/kwineffects.h b/libkwineffects/kwineffects.h
--- a/libkwineffects/kwineffects.h
+++ b/libkwineffects/kwineffects.h
@@ -1979,6 +1979,17 @@
      * @since 5.10
      */
     Q_PROPERTY(bool unresponsive READ isUnresponsive)
+
+    /**
+     * Whether the window is a popup.
+     *
+     * A popup is a window that can be used to implement tooltips, combo box popups,
+     * popup menus and other similar user interface concepts.
+     *
+     * @since 5.XX
+     **/
+    Q_PROPERTY(bool popupWindow READ isPopupWindow CONSTANT)
+
 public:
     /**  Flags explaining why painting should be disabled  */
     enum {
@@ -2230,6 +2241,11 @@
      */
     bool isUnresponsive() const;
 
+    /**
+     * @since 5.XX
+     **/
+    bool isPopupWindow() const;
+
     /**
      * Can be used to by effects to store arbitrary data in the EffectWindow.
      *
diff --git a/libkwineffects/kwineffects.cpp b/libkwineffects/kwineffects.cpp
--- a/libkwineffects/kwineffects.cpp
+++ b/libkwineffects/kwineffects.cpp
@@ -841,6 +841,7 @@
 WINDOW_HELPER(QStringList, activities, "activities")
 WINDOW_HELPER(bool, skipsCloseAnimation, "skipsCloseAnimation")
 WINDOW_HELPER(KWayland::Server::SurfaceInterface *, surface, "surface")
+WINDOW_HELPER(bool, isPopupWindow, "popupWindow")
 
 QString EffectWindow::windowClass() const
 {
diff --git a/shell_client.h b/shell_client.h
--- a/shell_client.h
+++ b/shell_client.h
@@ -163,6 +163,8 @@
 
     void updateColorScheme() override;
 
+    bool isPopupWindow() const override;
+
 protected:
     void addDamage(const QRegion &damage) override;
     bool belongsToSameApplication(const AbstractClient *other, SameApplicationChecks checks) const override;
diff --git a/shell_client.cpp b/shell_client.cpp
--- a/shell_client.cpp
+++ b/shell_client.cpp
@@ -1715,4 +1715,15 @@
     surface()->setOutputs(clientOutputs);
 }
 
+bool ShellClient::isPopupWindow() const
+{
+    if (m_shellSurface != nullptr) {
+        return m_shellSurface->isPopup();
+    }
+    if (m_xdgShellPopup != nullptr) {
+        return true;
+    }
+    return false;
+}
+
 }
diff --git a/toplevel.h b/toplevel.h
--- a/toplevel.h
+++ b/toplevel.h
@@ -210,6 +210,11 @@
      */
     Q_PROPERTY(KWayland::Server::SurfaceInterface *surface READ surface)
 
+    /**
+     * Whether the window is a popup.
+     **/
+    Q_PROPERTY(bool popupWindow READ isPopupWindow)
+
 public:
     explicit Toplevel();
     virtual xcb_window_t frameId() const;
@@ -443,6 +448,15 @@
     template <class T, class U>
     static T *findInList(const QList<T*> &list, std::function<bool (const U*)> func);
 
+    /**
+     * Whether the window is a popup.
+     *
+     * Popups can be used to implement popup menus, tooltips, combo boxes, etc.
+     *
+     * @since 5.XX
+     **/
+    virtual bool isPopupWindow() const;
+
 Q_SIGNALS:
     void opacityChanged(KWin::Toplevel* toplevel, qreal oldOpacity);
     void damaged(KWin::Toplevel* toplevel, const QRect& damage);
@@ -846,6 +860,20 @@
     return *it;
 }
 
+inline bool Toplevel::isPopupWindow() const
+{
+    switch (windowType()) {
+    case NET::ComboBox:
+    case NET::DropdownMenu:
+    case NET::PopupMenu:
+    case NET::Tooltip:
+        return true;
+
+    default:
+        return false;
+    }
+}
+
 QDebug& operator<<(QDebug& stream, const Toplevel*);
 QDebug& operator<<(QDebug& stream, const ToplevelList&);