Redmine

I find redmine way of closing as duplicate to be fairly confusing. I am never sure which of the two bugs I should update.

Just like redmine usability rocks comparing with bugzilla, here the bugzilla way - expicit

Mark as duplicate of [......]

would be nicer. Or, at the very least, improved wording of this association.

Also, duplicate marking is frequently performed while working on the issues list, it would be nice if one could mark as duplicate from there.