1 files changed, 4 insertions, 0 deletions
diff --git a/src/window/mapped.rs b/src/window/mapped.rs
index 299e0acc..adfab2d4 100644
--- a/src/window/mapped.rs
+++ b/src/window/mapped.rs
@@ -720,6 +720,10 @@ impl LayoutElement for Mapped {
         self.toplevel().with_pending_state(|state| state.size)
     }
 
+    fn is_child_of(&self, parent: &Self) -> bool {
+        self.toplevel().parent().as_ref() == Some(parent.toplevel().wl_surface())
+    }
+
     fn refresh(&self) {
         self.window.refresh();
     }