Code in #1283 incorrectly reports as clashing pages with the same url in different sites managed by the same django-cms project.
Fix is to make util.page_resolver.get_page_queryset_from_path site-aware.
Test and fix will follow soon
Test for #1426
could you open a pull request?
I planned to open one later: we're doing some in-house tests on live projects, to check it's really fixed.
Opened PR #1429
Make page_resolver.is_valid_url multisite aware, fixes #1426