[kmail2] [Bug 313516] New: Make "Group by subject" more intelligent, i.e. fuzzy

[Matthias Nagel]

https://bugs.kde.org/show_bug.cgi?id=313516

            Bug ID: 313516
           Summary: Make "Group by subject" more intelligent, i.e. fuzzy
    Classification: Unclassified
           Product: kmail2
           Version: 4.9.3
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: wishlist
          Priority: NOR
         Component: message list
          Assignee: kdepim-bugs at kde.org
          Reporter: mh-nagel at web.de

I like to group my mails by subject. Actually this works quite well, but there
is one very annoying problem:

The mails are only grouped if the subject lines matches exactly. This means,
everytime a mail is answered or forwarded and thereby extended by a "Fwd:" or
"Re:" in the subject line, the mails are not grouped together.

Please modify the grouping decision such that words like "Fwd:", "Re:" and so
on are ignored. (Probably additional or missing blanks at the beginning/end are
wise to be ignored, too.)

Otherwise grouping by subject is worseless in most cases.

Reproducible: Always

Steps to Reproduce:
1. Take a email folder and set the view such that the mails are grouped by
subject
2. Write an email with subject line "Foo".
3. Wait for an answer with subject line "Re: Foo" or "Fwd: Foo"
Actual Results:  
The mails with the subject lines
"Foo", "Re: Foo", "Fwd: Foo", "Re: Fwd: Re: Foo" and so on
are not grouped together.

Expected Results:  
Mails with the same subject line excecpt for the keywords "Re:",  "Fwd:" and
similar are groups together.

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