[KPhotoAlbum] One more patch -- correct merge and is-sorted logic

[Johannes Zarl-Zierl]

Looks good to me. Merged into git master.

Am Samstag, 12. Mai 2018, 05:01:03 CEST schrieb Robert Krawitz:
> My final patch of the day, and probably the least controversial.  The
> sort code in ImageInfoList.cpp uses <date,filename> as the sort 
key,
> but the isSorted() and merge code only looks at the date.  This
> resulted in my index.xml file having lost sort order over time.


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