D11282: less expensive findByUrl in KCoreDirListerCache

[Stefan Brüns]

bruns added inline comments.

INLINE COMMENTS

> mwolff wrote in kcoredirlister.cpp:2532
> this can be slow, see above

To make this more efficient, a little bit of reshuffling is needed IMHO:

1. Move the filter implementation from  `KDL::Private::addNewItem(...)` to `KDL::Private::addNewItems(...)`, i.e. sort the `items` based on `->matchesMimeFilter(item)` into two new QHashes
2. For each partition, use QHash::unite() to merge it into the respective list

3. Make `KDL::Private::addNewItem(...)` a wrapper function for `KDL::Private::addNewItems(...)`.

REPOSITORY
  R241 KIO

REVISION DETAIL
  https://phabricator.kde.org/D11282

To: jtamate, #frameworks, dfaure
Cc: kde-frameworks-devel, bruns, mwolff, michaelh, ngraham
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