fix(wm): hide non-focused windows in containers

This commit ensures that every non-focused index in a Ring<Window> will
be hidden when a new window is added and focused via
Container::add_window, which typically happens when
WindowContainerBehaviour::Append is enabled and a new window is opened.

re #889

komorebi/src/container.rs

@@ -116,6 +116,13 @@ impl Container {
     pub fn add_window(&mut self, window: Window) {
         self.windows_mut().push_back(window);
         self.focus_window(self.windows().len().saturating_sub(1));
+        let focused_window_idx = self.focused_window_idx();
+
+        for (i, window) in self.windows().iter().enumerate() {
+            if i != focused_window_idx {
+                window.hide();
+            }
+        }
     }
 
     #[tracing::instrument(skip(self))]

komorebi/src/process_event.rs

@@ -346,6 +346,8 @@ impl WindowManager {
                                     .ok_or_else(|| anyhow!("there is no focused container"))?
                                     .add_window(window);
                                 self.update_focused_workspace(true, false)?;
+
+                                stackbar_manager::send_notification();
                             }
                         }
                     }
@@ -546,6 +548,8 @@ impl WindowManager {
                                             )?;
                                         }
                                     }
+
+                                    stackbar_manager::send_notification();
                                 }
                             }
                         }