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The idea is about add option to put files pinned to or created on current activity at top.

This allow faster access to files and allow to organize work. For example. I have an activity called Vacation and Super Project activity. Vacation are activity related to my leisure activities like Holidays, etc. Super Project activity is related to my work (imagine I am computer graphic/designer). I have directory called photos and I put photos from my camera here. My work is related to my photo blog and patreon page (I public photos I made and my patreons will pay me for it).

Now, when I go to photos I except to work files related to my current activity. Maybe I will show photos from my last vacation? Maybe I will work on my blog? So I pin photo to some activity and, when I go into photo directory, files related to activity will be shown as first.

Why this idea? Because I probably will to have more directories with files related to many activities?

About sorting file by watching it is pinned to current activity, it is possible to do (in my opinion). About showing files creating on current activity - some information should been stored as extended attribute. I have another idea: allow to pin tag to activity, so Dolphin would show files with pinned tags firstly.