Bug#824353: abGate - strange GUI

[trebmuh at tuxfamily.org]

Dear maintainers, hello,

I've been retesting a bit deeply this and the situation is still the 
same.
(Ardour 5.3 and jalv.select 0.6).
Not that, even if the GUI is a bit odd, the plug still sounds to be 
working
as expected.

To add some more information here, I tested it in qtractor 0.7.9, and it
does work as expected *and* the GUI displays fine (ie: as expected).

Hope that helps.