D22888: Prefer categories with the query string visible in results

[Kai Uwe Broulik]

broulik created this revision.
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REVISION SUMMARY
  This logic was present in the old model and keeps e.g. Baloo file search results from getting higher priority than likely more useful application results with the given name. It only affects the order of categories, e.g. scoring "Applications" higher than "Documents" if such a match exists. The order of matches within a category is untouched and remains determined by the runner based on type and relevance.
  Since the "relevance" of a `QueryMatch` is global and determined freely by the runners which don't know what other results might already be present, we have to resort to some fuzzy logic like this.

TEST PLAN
  Searched for "quassel", got quassel application higher rated than my random sprint note file found by Baloo to contain the word quassel.

REPOSITORY
  R112 Milou

REVISION DETAIL
  https://phabricator.kde.org/D22888

AFFECTED FILES
  lib/resultsmodel.cpp
  lib/resultsmodel.h
  lib/runnerresultsmodel.cpp
  lib/runnerresultsmodel.h

To: broulik, #plasma
Cc: plasma-devel, LeGast00n, jraleigh, fbampaloukas, GB_2, ragreen, Pitel, ZrenBot, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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