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From Fedora bug #1440068, which I've accidentally reproduced in RHEL 7.4:
It can happen that folder tree on the left can only increase unread count, but not decrease.
Steps to reproduce (assumed there is configured an IMAPx account with GSSAPI authentication):
a) stop evolution
b) in terminal: kdestroy (there is no ticked for the account now)
c) run evolution
* it shows an error message at the top that the ticket is missing and
the folder tree shows only the account node with a connection error
on the right of the account node
d) switch to a terminal and run: kinit (and fill credentials)
e) switch back to evolution and expand the account node
* it loads properly now, folders are shown
f) select any folder from this account, where is at least one message
g) click in the icon column to mark one of the messages read or unread
While the count in the folder tree should increase when the message is marked as unread and decrease when it is marked read, it only increases the value when the messages is marked unread, but doesn't decrease the value when it is marked read. Having the ticket before start of evolution will make this behave as expected.
There is a patch for this in the Fedora bug, currently offered to the reporter for testing.
Tested manually on x86_64 using evolution-3.22.6-10.el7
I used reproducer from Description. Folders did show correct unread message count while increase and even decrease.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2017:2066