[Users] [Bug 3085] New: "Thread by Subject" sometimes requires a prefix (e.g. RE: ) sometimes does not when deciding if messages are part of same thread

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http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=3085

            Bug ID: 3085
           Summary: "Thread by Subject" sometimes requires a prefix (e.g.
                    RE: ) sometimes does not when deciding if messages are
                    part of same thread
    Classification: Unclassified
           Product: Claws Mail
           Version: GIT
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P3
         Component: UI/Message List
          Assignee: users at lists.claws-mail.org
          Reporter: aidenn0 at geocities.com

subject_hastable_lookup and subject_table_lookup are both used, but behave
differently.

Personally, I prefer that messages that are identical in subject be threaded
together, but either way, it should probably be consistent.

Changing the "if (prefix_length <= 0)" to "if (prefix_length < 0)" in
subject_hashtable_lookup gets the behavior that I expected, but I understand if
that's not the intended behavior of the feature.

To reproduce, you can have a mailbox with 2 messages with identical subjects,
but none of the threading related headers; they will not show up as threaded in
the thread view, but they will both be marked as ignored if you select "ignore
thread" on one of them.

I noticed also that the code for handling moved messagese uses
subject_table_lookup but I'm not sure if any odd behavior happens due to that.

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