[Nepomuk] KMail/Akonadi searching

[Christian Mollekopf]

Hey,

I spent today to improve the searching situation a bit, but couldn't fix all 
problems yet. It's a more of a workaround than a real fix as you can see but at 
least basic searching works this way. A better solution will need changes in 
some more places and probably nepomuk-core available (As I don't really feel 
like copying more stuff from the nepomuk repository). 

Additionally to nepomuksearchengine I also fixed nepomuksearch, although I 
don't know if it is used at all (I also haven't tested this part).

I also added on commit to kdepim (cbd7a8777a4bfd89125be4cf58e276b51388adc5) 
which quotes the search string, because otherwise a searchpattern consisting 
of several words is not interpreted as one pattern but rather the AND-
conjunction of each individual word.

Apart from the current solution being a rather ugly hack, there also exist two 
other problems:

- The search collection is indexed and then searched which is probably not 
what we want. If somebody can tell me how to determine the search collection 
(by some attribute or so) I could exclude it from the feeder. Another option 
would be to exclude it by adding a IndexPolicyAttribute to the search 
collection.

- Each query gets somehow executed twice. I can't see the call twice on the 
kmail side, but on the akonadi-server there are always two queries, no idea 
why.

Apart from those issues and the feeder not having indexed all emails here it 
works pretty well. The search itself seems pretty fast: ~1-3 seconds for a 
query resulting in a small result set, which searches through fulltext/and 
headers in ~80000 indexed emails. If the result set is large filling the table 
seems to be much more of a bottleneck than the actual query.

If the attached fixes are applied to akonadi and we manage to exclude the 
search collection, we'll have at least half-way decent searching in 4.8.

Cheers,
Christian
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