[kdepim] [Bug 447743] New: Make List-Id id and phrase available separately to grantlee for header themeing

[Erik Quaeghebeur]

https://bugs.kde.org/show_bug.cgi?id=447743

            Bug ID: 447743
           Summary: Make List-Id id and phrase available separately to
                    grantlee for header themeing
           Product: kdepim
           Version: GIT (master)
          Platform: unspecified
                OS: All
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: messageviewer
          Assignee: kdepim-bugs at kde.org
          Reporter: bugs.kde.org at e3q.eu
                CC: kdepim-bugs at kde.org
  Target Milestone: ---

AFAICT, all variables available to grantlee header theme editors are listed in

https://invent.kde.org/pim/messagelib/-/blob/master/messageviewer/src/header/grantleeheaderformatter.cpp

There, the List-Id header is exposed as a string containing all of the List-Id
header content. However, the List-Id header is structured
(https://datatracker.ietf.org/doc/html/rfc2919). Namely, it contains the actual
id between angle brackets and possibly also a descriptive phrase in front.
Because for presentation purposes, the phrase is more useful than the id
itself, it would be useful to expose these separately. The grantlee variable
header.listid could be modified to have properties/fields for each, so
header.listid.phrase (e.g., for display) and header.listid.id (e.g., for in
title attribute of element used to display header.listid.phrase). In case the
listid variable cannot be modified this way in a backwards-compatible manner,
perhaps a new variable, e.g., header.structuredlistid, can be added.

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