cubicweb #343325 wrong redirect on edition form cancellation [open]

we get redirected to the home page or another page opened in another tab (of the same app) sometimes

this happens whenever we re-authenticate (consecutively to an application restart) while on an edition form, then reland on the form, then hit cancel

or whenever the last visited page was from another browser tab (we then land on that page)

the url parameters look good (http://crater:9998/ticket/4591?__message=bienvenue admin !&vid=edition)

not really critical but, at least now documented ...

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