macOS: fix window cascading for 3rd+ window

macos/Sources/Features/Terminal/TerminalController.swift

@@ -256,6 +256,8 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
         // take effect. Our best theory is there is some next-event-loop-tick logic
         // that Cocoa is doing that we need to be after.
         DispatchQueue.main.async {
+            c.showWindow(self)
+
             // Only cascade if we aren't fullscreen.
             if let window = c.window {
                 if !window.styleMask.contains(.fullScreen) {
@@ -264,8 +266,6 @@ class TerminalController: BaseTerminalController, TabGroupCloseCoordinator.Contr
                 }
             }
 
-            c.showWindow(self)
-
             // All new_window actions force our app to be active, so that the new
             // window is focused and visible.
             NSApp.activate(ignoringOtherApps: true)