Also load up to three fallback layers for 'best quality first'

[philippotto]

Right now, the rendering strategies define how many fallback magnifications will be loaded so that these can be rendered. For progressive loading, three fallback magnifications are loaded. For best quality, only one fallback mag was loaded until now. The reasoning behind this was that additional fallbacks shouldn't be necessary (since they are loaded with lower priority). However, this had the effect that missing data couldn't be covered by fallback data if that fallback was more than one mag apart.
I simply changed the value of how many fallback mags should be loaded to three. This can produce more traffic, but since the lower mags have lower priority when using "best quality first", this shouldn't affect the perceived loading speed.

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• Open a dataset for which data only exists in mag 4 or mag 8.
• Select "best quality first" and disable "render missing data black"
• Data should be visible when zooming to mag 1

Issues:

• fixes "Best quality first" does not respect disabled "render missing data black" option #4444

---

• Updated changelog
• [ ] Updated migration guide if applicable
• [ ] Updated documentation if applicable
• [ ] Adapted wk-connect if datastore API changes
• [ ] Needs datastore update after deployment
• Ready for review

[MichaelBuessemeyer]

Looks to me like this PR also resolves #4329 🧐

[MichaelBuessemeyer]

The Also load up to three fallback layers for 'best quality first'-part works perfectly 👍

In the changes in the comment tab, I found only one thing in the code.

While testing the memoized version of the comment tab, I noticed that either the diffing between versions of the trees or that the relevant actions are not complete. At least these are my guesses.

Here is the "bug free" master:

And here is your branch on my local machine:

Could you please fix this before merging?

[MichaelBuessemeyer]

btw: Awesome idea to also memoize the tree-data 🚀

[philippotto]

Looks to me like this PR also resolves #4329 🧐

Sorry, this was not my intention. I removed these changes again and created a new PR for them. Could you please re-review/accept the current PR? :)

[MichaelBuessemeyer]

The Also load up to three fallback layers for 'best quality first'-part works perfectly 👍

I suppose that this still works as I cannot test this again at the moment. But this should not block this PR 😄

Feel free to merge