Copy-paste produces document with problematic names when title has accented characters (generateDocumentName in Jackrabbit session)

Scenario:

• Create a document with a title with accented characters such as"Master français". Its "name" property is correctly formated in "master-francais" (so everything is well).
• One copy-pastes this document in the same folder.
• The "name" property of the newly created document is "Master_français.1233059473537" (instead of a better "master-francais.1233059473537").

This causes some operations of the Nuxeo shell, such as rm, to be unusable with errors such as:
Caused by: org.nuxeo.ecm.core.api.WrappedException: Exception: javax.jcr.PathNotFoundException. message: ecm:children/default-domain/ecm:children/workspaces/ecm:children/ws1/ecm:children/fichiers/ecm:children/Master_français.12345342901157
at org.apache.jackrabbit.core.NodeImpl.getNode(NodeImpl.java:2501)
at org.nuxeo.ecm.core.repository.jcr.JCRSession.resolvePath(JCRSession.java:285)