Is there a recycle bin (or some similar mechanism) for deleted messages?
I have on occasion accidentally hit the delete key while an incoming message is open. Of course, that's what I normally do when I want to delete a message, but sometimes it's an accident. The message irretrievably and permanently disappears. Shouldn't there be some kind of "recycle bin"? Shouldn't it goes into my "Trash" folder--isn't that what it's for? Shouldn't it go into my [Gmail]->Trash folder? I'm using version 45.1.0 on Windows XP, with a gmail account, with imap.gmail.com
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Shouldn't there be some kind of "recycle bin"?
There should.
Shouldn't it goes into my "Trash" folder
Verify your account settings.
At the top right of the Thunderbird window, click the menu button 
> Options > Account Settings > Server Settings.
When I delete a message - Move it to this folder - select your Trash folder for the Gmail account from the drop-down menu.
Learn how Gmail IMAP works, it's not necessarily what one would expect. Your deleted messages may still exist on the server. https://support.google.com/mail/answer/78755 https://support.google.com/mail/answer/82367 https://support.google.com/mail/answer/77657