In our previous post, we wrote about the many regressions users of the Release Channel are plagued with. Today we're focusing on the history of a particular issue, which affects all users of a localised (non-English) version of Thunderbird.
Traditionally, Thunderbird aimed at showing names for "special folders" (Inbox, Sent, Templates, Trash, Archives, etc.) the way they were shown in the mail providers web interface. That was achieved by listening to user requests in various bugs, for example Bug 1320191 on the Microsoft "Deleted" folder, or Bug 543227 on incorrect names of other IMAP folders.
In their infinite wisdom, the Thunderbird folks changed this behaviour for no good reason in Bug 1960526, so a SPAM folder called "Bulk" would be called "Junk" (later "Spam" after migrating "Junk" to "Spam" in Bug 1823084), which gave rise to Bug 1979511.
Attempting to fix Bug 1979511 led to Bug 1993842, where special IMAP folders were always shown in English. That was fixed, but now the behaviour has returned to the "infinite wisdom" change, were standard names of the special IMAP folders are used instead of the names in the web interface. This was filed as Bug 1998456.
Let's not mention that in the course of the events, some localised folders were shown with garbled/mojibake names for a while, Bug 1994890.
Is your head spinning already with all the bug numbers? Do you think the Release Channel version is good enough for productive use?