diff --git a/src/shell/layout/combined.rs b/src/shell/layout/combined.rs
index 87cdda68..2e36dc82 100644
--- a/src/shell/layout/combined.rs
+++ b/src/shell/layout/combined.rs
@@ -3,13 +3,10 @@ use smithay::{
     desktop::{Space, Window},
     reexports::wayland_protocols::xdg_shell::server::xdg_toplevel::ResizeEdge,
     wayland::{
-        compositor::with_states,
         seat::{PointerGrabStartData, Seat},
-        shell::xdg::XdgToplevelSurfaceRoleAttributes,
         Serial,
     },
 };
-use std::sync::Mutex;
 
 struct Filtered;
 
@@ -18,15 +15,11 @@ pub struct Combined<A: Layout, B: Layout> {
     second: B,
     windows_a: Vec<Window>,
     windows_b: Vec<Window>,
-    filter: Box<dyn Fn(Option<&str>, Option<&str>) -> bool>,
+    filter: Box<dyn Fn(&Window) -> bool>,
 }
 
 impl<A: Layout, B: Layout> Combined<A, B> {
-    pub fn new(
-        first: A,
-        second: B,
-        filter: impl Fn(Option<&str>, Option<&str>) -> bool + 'static,
-    ) -> Combined<A, B> {
+    pub fn new(first: A, second: B, filter: impl Fn(&Window) -> bool + 'static) -> Combined<A, B> {
         Combined {
             first,
             second,
@@ -45,40 +38,23 @@ impl<A: Layout, B: Layout> Layout for Combined<A, B> {
         seat: &Seat,
         focus_stack: Box<dyn Iterator<Item = &'a Window> + 'a>,
     ) {
-        if let Some(surface) = window.toplevel().get_surface() {
-            let filtered = with_states(surface, |states| {
-                let attrs = states
-                    .data_map
-                    .get::<Mutex<XdgToplevelSurfaceRoleAttributes>>()
-                    .unwrap()
-                    .lock()
-                    .unwrap();
-                if (self.filter)(attrs.app_id.as_deref(), attrs.title.as_deref()) {
-                    window.user_data().insert_if_missing(|| Filtered);
-                    true
-                } else {
-                    false
-                }
-            })
-            .unwrap_or(false);
-            if filtered {
-                self.windows_b.push(window.clone());
-                return self.second.map_window(
-                    space,
-                    window,
-                    seat,
-                    Box::new(focus_stack.filter(|w| w.user_data().get::<Filtered>().is_some())),
-                );
-            }
+        if (self.filter)(window) {
+            self.windows_b.push(window.clone());
+            self.second.map_window(
+                space,
+                window,
+                seat,
+                Box::new(focus_stack.filter(|w| w.user_data().get::<Filtered>().is_some())),
+            )
+        } else {
+            self.windows_a.push(window.clone());
+            self.first.map_window(
+                space,
+                window,
+                seat,
+                Box::new(focus_stack.filter(|w| w.user_data().get::<Filtered>().is_none())),
+            )
         }
-
-        self.windows_a.push(window.clone());
-        return self.first.map_window(
-            space,
-            window,
-            seat,
-            Box::new(focus_stack.filter(|w| w.user_data().get::<Filtered>().is_none())),
-        );
     }
 
     fn refresh(&mut self, space: &mut Space) {
diff --git a/src/shell/layout/mod.rs b/src/shell/layout/mod.rs
index 124093e6..81e075f6 100644
--- a/src/shell/layout/mod.rs
+++ b/src/shell/layout/mod.rs
@@ -4,11 +4,14 @@ use smithay::{
     desktop::{Space, Window},
     reexports::wayland_protocols::xdg_shell::server::xdg_toplevel::ResizeEdge,
     wayland::{
+        compositor::with_states,
         output::Output,
         seat::{PointerGrabStartData, Seat},
+        shell::xdg::XdgToplevelSurfaceRoleAttributes,
         Serial,
     },
 };
+use std::sync::Mutex;
 
 pub mod combined;
 pub mod floating;
@@ -70,15 +73,38 @@ pub fn new_default_layout(idx: u8) -> Box<dyn Layout> {
     Box::new(combined::Combined::new(
         tiling::TilingLayout::new(idx),
         floating::FloatingLayout,
-        |app_id, title| {
-            slog_scope::debug!(
-                "New filter input: ({}:{})",
-                app_id.unwrap_or("<unknown>"),
-                title.unwrap_or("<no title>")
-            );
-            match (app_id.unwrap_or(""), title.unwrap_or("")) {
-                ("gcr-prompter", _) => true,
-                _ => false,
+        |window| {
+            if let Some(surface) = window.toplevel().get_surface() {
+                with_states(surface, |states| {
+                    let attrs = states
+                        .data_map
+                        .get::<Mutex<XdgToplevelSurfaceRoleAttributes>>()
+                        .unwrap()
+                        .lock()
+                        .unwrap();
+
+                    // simple heuristic taken from
+                    // sway/desktop/xdg_shell.c:188 @ 0ee54a52
+                    if attrs.parent.is_some()
+                        || (attrs.min_size.w != 0
+                            && attrs.min_size.h != 0
+                            && attrs.min_size == attrs.max_size)
+                    {
+                        return true;
+                    }
+
+                    // else take a look at our exceptions
+                    match (
+                        attrs.app_id.as_deref().unwrap_or(""),
+                        attrs.title.as_deref().unwrap_or(""),
+                    ) {
+                        ("gcr-prompter", _) => true,
+                        _ => false,
+                    }
+                })
+                .unwrap_or(false)
+            } else {
+                false
             }
         },
     ))