What if you add more apps than the height/width of the panel?
I tested with many opened apps and here's what I get:
They fill up the entire bar and you can't even see the Wishker menu, or the new opened apps.
They are also going over the top bar.
Did you test for this scenario? Maybe a good idea would be to scroll down through the apps if they are too many, as soon as the mouse cursor goes towards the bottom or top of the list.