Forward button of ports not enabled if it is selected and connected to a successor port
Observed behavior
As title says. The button is enabled after reselecting the port. Probably, the inverse setup (backwards button of output ports) is also affected by this behavior.
Expected behavior
The button should be enabled a soon as a connection is added. Therefore, a listener should be installed.
(from redmine: issue id 3516, created on 2018-09-17, closed on 2018-09-18)