[Bug 1826874] [NEW] In Ubuntu's Thunderbird, Empty Deleted warns, Empty "Inbox"!

[A. Richard Miller]

Public bug reported:

Issue: In Ubuntu desktop 18.10 and 19.04 (and perhaps years earlier?),
when a Thunderbird user clicks on File>Empty Deleted, it warns that
Empty "Inbox" will be done, instead! Ouch! (It does empty the correct
folder anyway, but this should and does scare many users.)

After a protracted dialog with the Mozilla Thunderbird support team,
I've learned that Mozilla's own vanilla Thunderbird shows Empty "Trash",
as it should. They say that the version of Thunderbird that comes
bundled with Ubuntu is to blame - so please fix it.

Note 1: Specifically, this wrong routine threatens to empty the active
folder; commonly, that folder is "Inbox".

Note 2: There's no prompt at all, if the "Trash" dialog box is
suppressed. But default is (and should be) to have it enabled.

Note 3: You can view the details of my Mozilla trouble-shooting (including my/Ubuntu's erroneous Thunderbird screen-print and Mozilla's correct one), here:
https://support.mozilla.org/en-US/questions/1254659#answer-1216735

** Affects: thunderbird (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  In Ubuntu's Thunderbird, Empty Deleted warns, Empty "Inbox"!

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