Duplicate fields in selector in MessageView

[Cécile Camillieri]

We can now add multiple elements with the same name in the RamListComponent (see #351).

This has revealed an issue in the MessageView where some classes and metaclasses are displayed more than once. This most probably means that the provider adds several time the same elements to its returned list. This example screenshot shows what is displayed in the selector for an operation in the CheckPointing Aspect of the Transaction concern.

[Matthias Schoettle]

I cannot reproduce this (anymore). Might have been fixed at some point without referencing this issue. Reopen this issue if it is still a problem.