Knut: your comments reveal a relatively shallow understanding of the
email environment.  And they show you haven't understood the real
situation with Evolution.  As for discussions of how IMAP servers ought
to work, you should be filing those bugs with the teams that create the
IMAP servers; I'm sure they'll welcome your input.

The comments around moving files into/out of Trash shows you haven't
read the various discussions of the problem (even to bugs marked as
duplicates in Gnome Bugzilla).  There is no "real" Trash folder in
Evolution, so there is no move or copy of email from any other folder
into Trash.  Trash is a virtual folder: it doesn't exist physically, but
instead is constructed as a user-interface artifact, containing all the
messages that are marked as deleted.  Thus, to delete a message (have it
appear in Trash) all that has to be done is mark that message as
deleted.  To undelete a message, you just remove the deleted attribute
and it reappears exactly where it was before... because it was never
moved anywhere else.  There is no copy involved with delete, no extra
space consumed, etc.  And similarly, there is no copy involved with
undelete either.

This is why messages appear in "Trash" when you move them to another
folder: as I've described there is no MOVE operation in IMAP, so a MOVE
must be implemented as a COPY followed by a delete.  When you mark a
message deleted that message appears in the Trash folder.

I do understand Mathias's frustration, but unfortunately it's not so
simple.  Mathias you suggest it's just a matter of Evolution hiding
these details, but that cannot be done reliably.  There is only one
delete flag in IMAP, so there is no way to make a distinction on the
server between messages that are deleted by hand, and those that are
deleted as a side-effect of a desired move operation.  They are
identical as far as any IMAP client is concerned.

Yes, of course, Evolution could maintain its own local list of messages
that should be hidden rather than displayed in Trash because they are a
side-effect of a copy/delete.  However this list would be present only
in that instance of Evolution.  If you ever attached to your IMAP server
using a different Evolution (say on a laptop or work system), or you
used a webmail client or another IMAP client (maybe on your smart phone,
etc.), all those extra deleted messages WOULD appear there, and you'd
have even more confusion and bugs reported.

-- 
Move is Copy + Thrash, should be Move that removes all traces of the first.
https://bugs.launchpad.net/bugs/365270
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is a bug assignee.

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