Preemptive caching

[jakoss]

Adds preemptive caching to #1769
Fixes #3169

I had to do some refactoring to implement this feature. I had to make the "enumeration" functions more independent of ItemViewModel. I moved out some methods out of viewmodel, just for sake of readability and just to be a little more SOLID. I managed to lower ItemViewModel line count by 200.

There's one question from me. What is the reason to keep Win32 files enumeration along with Windows.Storage? I measured a little bit and i used application with only Windows.Storage enumeration and i didn't found significant performance difference. All gains from using direct C++ apis are minimal compared to other required operations in EnumerateItemsFromStandardFolderAsync. So i believe that using that introduces a lot of complicated and doubled logic without any real gain. @yaichenbaum @gave92 What do you think about that?

I'll tackle the "double loading" issue in next Pull Request.

[gave92]

Windows.Storage does not list shortcut files and hidden items
And Win32 does not work on phone storage and network paths

[jakoss]

Windows.Storage does not list shortcut files and hidden items
And Win32 does not work on phone storage (and network?)

Ok, so removing that is not an option

[gave92]

And none of those work on recycle bin xD yeah it's complicated

[yaira2]

@jakoss It seems like the NumberBox Header is skipped over by the screen reader, can you check that out?

[gave92]

I love the ItemViewModel refactoring :)

An issue I'm seeing is that with this option enabled folder switching is sometimes delayed (I'll try to post a video). Is it just me?

[yaira2]

Sorry, I had busy week. I need to merge hez2010 changes in here and that will take me some time. I'll try to do this sometime next week

It's no rush, thank you for the update.

[jakoss]

@yaichenbaum @gave92 I merged the changes from main branch, it was quite a ride after @hez2010 PR. But i think i got it right. Not sure about the end result after all. It does speed up things on my computer, but i have only nvme drives to test that on. And even on those the speedup is not really that mindblowing. Try it out on your machines.

Also there are minor changes to PersistentSQLiteCacheAdapter that should resolve the #3169

I also made the adjustement to cache only the first 32 loaded items, since it's all we need to "visually" improve loading time.

[gave92]

@jakoss I updated this PR with the latest changes from main. I hope I haven't screwed anything up. Small changes mostly to PersistentSQLiteCacheAdapter. Should be ready for merging.

[yaira2]

@jakoss Thank you!