[kmail2] [Bug 390166] New: Folder list should show number of unread mails for top-level folder and children separately

[quazgar]

https://bugs.kde.org/show_bug.cgi?id=390166

            Bug ID: 390166
           Summary: Folder list should show number of unread mails for
                    top-level folder and children separately
           Product: kmail2
           Version: 5.6.3
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: minor
          Priority: NOR
         Component: folders
          Assignee: kdepim-bugs at kde.org
          Reporter: quazgar at posteo.de
  Target Milestone: ---

Currently, the folder list shows the total number of unread messages for a
folder and its sub-folders:

-Debian              100

So all of the two following cases could be the case:

-Debian             100
 |--Debian KDE        0
 |--Debain Users      0

or

-Debian              20
 |--Debian KDE       30
 |--Debain Users     50

or

-Debian               0
 |--Debian KDE       80
 |--Debain Users     20

It would be useful (and in earlier versions of KMail this was the case) if a
collapsed top-level folder indicated somehow the number of top-level unread
messages in addition to the overall number.  IIRC previously it was:

- "100" if there are only 100 unread top-level messages.
- "20 + 80" if there are 20 in the top-level folder and 80 messages in the
children.
- "0 + 100" if there are no top-level and 100 unread child folders messages.

This would increase the usability again since the user does not open the
top-level folder in vain but can simply extend the view in the folder tree view
to show th children first, before deciding which folder to open in the message
list.

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