fix(wm): focus single window on show event

This commit makes sure we refocus the window on `Show` event when it is
the only window on the workspace.

This is needed because some windows send the `FocusChange` event before
the `Show` event and on the first event we will be focusing the desktop
window to unfocus any previous window from other workspace because the
workspace will still be empty. So after adding the window, we need to
focus it again.

komorebi/src/process_event.rs

@@ -387,6 +387,21 @@ impl WindowManager {
                                 }
                             }
                         }
+
+                        if (self.focused_workspace()?.containers().len() == 1
+                            && self.focused_workspace()?.floating_windows().is_empty())
+                            || (self.focused_workspace()?.containers().is_empty()
+                                && self.focused_workspace()?.floating_windows().len() == 1)
+                        {
+                            // If after adding this window the workspace only contains 1 window, it
+                            // means it was previously empty and we focused the desktop to unfocus
+                            // any previous window from other workspace, so now we need to focus
+                            // this window again. This is needed because sometimes some windows
+                            // first send the `FocusChange` event and only the `Show` event after
+                            // and we will be focusing the desktop on the `FocusChange` event since
+                            // it is still empty.
+                            window.focus(self.mouse_follows_focus)?;
+                        }
                     }
 
                     if workspace_contains_window {