Permanently removing a collection from visiblity

[Robert2413]

Right now, if you apply "delete headers and threads" to a collapsed Collection, the Collection will reappear if any more of its elements are posted and the headers are downloaded to UE. I think that most people would prefer to have the collection disappear permanently from view if the uder applies "delete headers and threads" to it. This action makes it clear that the user is not interested in that particular Collection and does not want to have to delete it more than once, even if more of its elements are posted after the Collection is initially deleted.

[alex]

there is no posting standard like in case with partials, it means several posts may get into the same collection, so it could be only an option, and you would need to verify such possibility before you invoke delete.

but right now i don't concentrate on such small details, i want to ensure first the code is as clean as possible even if it seems to run ok, since it was changing internals unlike most previous releases.