Review Request: Add an absolute date filter

[Daniel Faust]

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http://git.reviewboard.kde.org/r/103546/
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Review request for Amarok.


Description
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This patch adds a collection filter (including gui) to filter using an absolute date (e.g. 26.11.2011). It's an addition to the current time difference mode (e.g. 1 month ago).
Currently filtering the collection by date is a bit confusing and even though there is a gui (in the EditFilterDialog) to select a certain date it gets instantly converted to a time difference. This patch make a clear difference between these two modes (absolute and relative time specification).

The date can be formatted in tree ways, default is the local short format (KLocale::ShortFormat) following regex are also possible:
(\d{1,2})[-.](\d{1,2})
(\d{1,2})[-.](\d{1,2})[-.](\d{4})

The way time differences are handled gets unified though that leads to some code duplication that should also be dealt with.
A new filter condition 'NewerThan' (opposide of 'OlderThan') gets added.

I hope that I didn't forget anything important.


Diffs
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  src/core-impl/collections/support/TextualQueryFilter.h 31860a3 
  src/core-impl/collections/support/TextualQueryFilter.cpp 2374dbd 
  src/dialogs/EditFilterDialog.cpp 58c2956 
  src/widgets/MetaQueryWidget.h 3974fb7 
  src/widgets/MetaQueryWidget.cpp 57b622f 
  src/widgets/TokenPool.cpp 2889442 

Diff: http://git.reviewboard.kde.org/r/103546/diff/diff


Testing
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I tested filtering the collection and editing the filters with the EditFilterDialog.


Thanks,

Daniel Faust

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