Add option to load all thumbnails at startup and don't unload them

[soredake]

Checklist

• I made sure that there are no existing issues - open or closed - to which I could contribute my information.
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• I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
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• This issue contains only one feature request.
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Feature description

It will be nice to have option to load all thumbnails at startup and don't unload them, like in this app https://play.google.com/store/apps/details?id=com.google.android.apps.photosgo

Why do you want this feature?

I love to scroll my images fast, and i don't love seeing them loading on-demand or unloading when i scroll.

Additional information

No response

[Aga-C]

Would this be enough for you: #136?

[soredake]

If disabling this "fade-in" effect will mean that all thumbnails will always be loaded (as startup too), then yes.