Update internal xwm window layering

src/api.rs

@@ -731,6 +731,8 @@ impl tag_service_server::TagService for TagService {
                 return;
             };
 
+            state.fixup_xwayland_internal_z_indices();
+
             state.request_layout(&output);
             state.update_focus(&output);
             state.schedule_render(&output);
@@ -758,6 +760,8 @@ impl tag_service_server::TagService for TagService {
                 tag.set_active(true, state);
             });
 
+            state.fixup_xwayland_internal_z_indices();
+
             state.request_layout(&output);
             state.update_focus(&output);
             state.schedule_render(&output);

src/focus.rs

@@ -73,6 +73,8 @@ impl State {
 
         self.z_index_stack.retain(|win| win != &window);
         self.z_index_stack.push(window);
+
+        self.fixup_xwayland_internal_z_indices();
     }
 
     /// Get the currently focused output, or the first mapped output if there is none, or None.

src/handlers/xwayland.rs

@@ -22,7 +22,7 @@ use smithay::{
         X11Surface, X11Wm, XwmHandler,
     },
 };
-use tracing::{debug, error, trace};
+use tracing::{debug, error, trace, warn};
 
 use crate::{
     focus::keyboard::KeyboardFocusTarget,
@@ -510,6 +510,28 @@ impl XwmHandler for State {
     }
 }
 
+impl State {
+    pub fn fixup_xwayland_internal_z_indices(&mut self) {
+        let Some(xwm) = self.xwm.as_mut() else {
+            return;
+        };
+
+        let x11_wins = self
+            .space
+            .elements()
+            .filter(|win| win.is_on_active_tag())
+            .filter_map(|win| win.x11_surface())
+            .cloned()
+            .collect::<Vec<_>>();
+
+        for x11_win in x11_wins {
+            if let Err(err) = xwm.raise_window(&x11_win) {
+                warn!("Failed to raise xwayland window: {err}");
+            }
+        }
+    }
+}
+
 /// Make assumptions on whether or not the surface should be floating.
 ///
 /// This logic is taken from the Sway function `wants_floating` in sway/desktop/xwayland.c.