[GUI] Deleting a failure-marked connection removes the connection but not the failure marker
To reproduce:
- open the attached model
- open the component architecture
- observe that the connection between C1 and C2 has a failure marker
- delete the connection (click on it, press Delete)
What happens:
- the connection disappears but the marker is still displaying
Expected:
- the connection and the marker should disappear
(from redmine: issue id 2126, created on 2014-09-05, closed on 2015-06-01)
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