Show labels associated with an e-mail or conversation
Feature summary
Right now, there is no way to know what labels are currently applied to an e-mail or conversation, if any.
How would you like it to work?
Labels should be displayed at the top of the conversation thread, or at the top of each individual e-mail, or the list of labels should include checkboxes (as in GMail).
Since there can be a discrepancy between the labels applied to a whole conversation and those applied only to some e-mails in the conversation, maybe the labels should be shown for the whole conversation, and only the diff (missing or extra labels with respect e.g. to the first message) displayed for individual e-mails? GMail deals with this poorly (no visibility of the situation in the interface, this can cause confusing results when searching by label, and the only way to homogenize labels across all e-mails in the conversation is to remove & re-add one).