cubicweb #1362090 single notification email on mass modification [open]

When publishing a version in the forge, you get 1 notification email for the state change of the version, plus one for each ticket whose state is changed. Same thing when several tickets are moved from one version to another in one go. I feel these cases should be better handled by the notification mechanism and a single mail should be sent.

(submitting the ticket on the cw projet, but this might be tracket-specific)

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