fix(wm): hide border when unmanged windows are focused

Previously we were dropping events that don't pertain to managed
windows, with one exception in should_manage that could probably do with
further cleanup (DisplayChange).

This first step fixes the latent border window problem, where we would
retain a border window when the last managed window was closed and focus
transitioned to an unmanaged window.

komorebi/src/process_event.rs

@@ -65,6 +65,26 @@ impl WindowManager {
             return Ok(());
         }
 
+        let should_manage = event.window().should_manage(Some(*event))?;
+
+        // Hide or reposition the window based on whether the target is managed.
+        if BORDER_ENABLED.load(Ordering::SeqCst) {
+            if let WindowManagerEvent::FocusChange(_, window) = event {
+                let border_window = Border::from(BORDER_HWND.load(Ordering::SeqCst));
+                if should_manage {
+                    border_window.set_position(*window, true)?;
+                } else {
+                    border_window.hide()?;
+                }
+            }
+        }
+
+        // All event handlers below this point should only be processed if the event is
+        // related to a window that should be managed by the WindowManager.
+        if !should_manage {
+            return Ok(());
+        }
+
         if let Some(virtual_desktop_id) = &self.virtual_desktop_id {
             if let Some(id) = current_virtual_desktop() {
                 if id != *virtual_desktop_id {

komorebi/src/windows_callbacks.rs

@@ -198,13 +198,9 @@ pub extern "system" fn win_event_hook(
         Some(event) => event,
     };
 
-    if let Ok(should_manage) = window.should_manage(Option::from(event_type)) {
-        if should_manage {
-            winevent_listener::event_tx()
-                .send(event_type)
-                .expect("could not send message on winevent_listener::event_tx");
-        }
-    }
+    winevent_listener::event_tx()
+        .send(event_type)
+        .expect("could not send message on winevent_listener::event_tx");
 }
 
 pub extern "system" fn border_window(