[desktop_multi_windows] memory issue

[Ansh-Rathod]

I tried to create the multi-windows, and it works but I remember somewhere reading that every new window using this plugin runs on a different flutter engine on a different thread. I don't see the resources getting released when you close the sub-windows. I made a test app where I created a new window did something in it then closed it, did these steps 10 times, and checked the activity monitor and it went above the 1.5 GB for the app. If this is the case an app won't be very usable because of this memory leak.

Thank you.