[460317] Shouldn't use == to compare URIs.

Graph.hasChild was failing on Juno and earlier platforms
because of our use of "==" for the URI comparison. The URI
pooling that allows for such comparisons has only been
introduced more recently in EMF.

Bug: 460317
Change-Id: I5db848f64eaa54c6e3f7225dd4c3a3f170222698
Signed-off-by: Laurent Goubet <laurent.goubet@obeo.fr>
Also-by: Axel Richard <axel.richard@obeo.fr>
15 files changed