A couple three problems with the percussion dialog in version 4.5.2

Percussion dialog in version 4.5.2 can be resized to non-existence:

The dialog title bar characters overlap upon resizing of the dialog:

In this image, you'll have to look closely. But if you open a percussion dialog in 4.5.2, you'll see what I mean.

And, the Customize kit option leads back to a slightly changed percussion customize dialog which I find just as infuriating as the original. There has to be a better way than that. But that's just my pet peeve, your mileage will vary.

(as a side note, brackets and braces are still not able to have names, but that should be filed under something else I don't know what at this point.)