[kmail2] [Bug 449329] New: ENH: Filter should support full Boolean logic

[quazgar]

https://bugs.kde.org/show_bug.cgi?id=449329

            Bug ID: 449329
           Summary: ENH: Filter should support full Boolean logic
           Product: kmail2
           Version: 5.15.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: kdepim-bugs at kde.org
          Reporter: quazgar at posteo.de
  Target Milestone: ---

SUMMARY

Currently the mail filters only support full conjunction (AND) or disjunction
(OR) over all criteria.  The filters could become much more expressive if
nested criteria could be defined, such as `a AND (b OR c)` or even `(NOT "From
= foo") AND ("Subject = Interesting")`.

For me this would resolve use cases where for example I receive mails to
different addresses on the same mailbox, and I want to apply different filters
on some of them.

UI/UX IDEAS

Unfortunately I do not have a completely intuitive UI in mind which would be
ideal for casual and power filter users alike.

SOFTWARE/OS VERSIONS

Linux/KDE Plasma: Currently 5.15.3 (20.08.3) on Debian Bullseye

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