[KPhotoAlbum] Big performance problem with QDateTime

[Robert Krawitz]

On 9/20/20 12:05 PM, Tobias Leupold wrote:
>> Well, we'll see.  It's not the first bug that's been filed on this, and their response has been
>> "comparing dates Is Complicated (tm)".
> 
> Yeah, same e. g. for https://bugreports.qt.io/browse/QTBUG-77721 ;-)

I created a nice, simple test case (attached).
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