[kontact] [Bug 333208] New: autocomplete uses wrong ranking and recall is incomplete

[Rigo Wenning]

https://bugs.kde.org/show_bug.cgi?id=333208

            Bug ID: 333208
           Summary: autocomplete uses wrong ranking and recall is
                    incomplete
    Classification: Unclassified
           Product: kontact
           Version: 4.12.97
          Platform: openSUSE RPMs
                OS: other
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: mail
          Assignee: kdepim-bugs at kde.org
          Reporter: rigo at w3.org

I have three address books and tons of email: One SoGO address book I only
rarely use, my Personal Contacts that I often use and some linkedin import that
is there in case I don't have the person in the other two. Baloo indexed all my
email. Now I want to write a new message. 
In KMail, I click on new message. In the to: field I start typing the last
name. After 4 letters, a long list of suggestions is shown. (Works really
quickly now). The list is organized according to the sources the suggestion
comes from. 
Often, I know positively that there is a contact in my personal contacts. If I
start to type the last name, sometimes only addresses from SoGO are shown plus
a long list from "other sources" that Baloo had recorded from the indexed
emails (With all the variations of the email address name that was ever used in
the emails I received from others). So completion works, but not as expected. 

Reproducible: Always

Steps to Reproduce:
1. create new email
2. type in last name of one of your contacts 
3. enjoy a long unordered list of all iterations of that email known to the
system
Actual Results:  
Precision is fine as I have only rarely/none false positives. Recall is low as
results are missing. I know I have a contact in my personal contacts and it
isn't shown. Instead, only the result from the SoGO address book is shown and a
long list of matches generated from harvesting my incoming email

Expected Results:  
Better recall: At least the addresses from the local address books should be
found reliably
Better ordering: The email address is a unique ID, thus very easy to sanitize
in an IT system. So the email should be only shown once from every source. It
may make sense to let the user expand the list with a [more ...] to see the
full list of matches

The address books should be shown in order: Local first and then remote and
then what was harvested from the incoming email.

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