Review Request 111808: Introduce a new signal for the case that the groups have changed, even though no items have been moved at all

[Frank Reininghaus]

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http://git.reviewboard.kde.org/r/111808/
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Review request for Dolphin.


Description
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This is based on https://git.reviewboard.kde.org/r/111807/.

This patch aims to remove the need to emit the "itemsMoved" signal if no items have been moved at all. Up to now, the view still needs this signal to adapt to the (possibly changed) groups. I think it's better to emit a new signal in that case.

The benefits of this patch include:
* Can improve the performance: no expensive updates needed if no items have been moved after a resorting.
* Allows to re-enable some unit tests which have been disabled some time ago.
* Makes it easier to find a better version of https://git.reviewboard.kde.org/r/111721/


Diffs
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  dolphin/src/kitemviews/kfileitemmodel.cpp 1b4911d 
  dolphin/src/kitemviews/kitemlistview.h 6467b8c 
  dolphin/src/kitemviews/kitemlistview.cpp 0c3183c 
  dolphin/src/kitemviews/kitemmodelbase.h 70f6883 
  dolphin/src/tests/kfileitemmodeltest.cpp 0ad7a37 

Diff: http://git.reviewboard.kde.org/r/111808/diff/


Testing
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Unit tests pass. Haven't seen any regressions so far.


Thanks,

Frank Reininghaus

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