concurrent library scanning and analysis

[Be]

It would be nice if there was an easy way to have Mixxx scan the library for new tracks and add them to the analysis queue as it finds new tracks. On first startup with a fresh database and when adding a new library folder, the user should be presented with the option to scan the library, scan and analyze, or neither. This should improve the first run experience considerably.

[Be (be.ing)]

On further thought, I am doubting that we should bother users with the choice between scanning and scanning + analysis. With analysis, scanning, and database transactions each in their own proper threads and not hanging the GUI, I think we could just replace the automatic scan on first start with automatic scan + analysis. If the user wants to cancel analysis part way through, they could click a cancel button in the library GUI.

[Be (be.ing)]

Related: Bug #1741676 (add tracks to library as scanner is running)

[Daniel Schürmann (daschuer)]

We have to consider, that the beatgrid and waveforms took a significant HD space.
So I am in doubt that analyzing by default is a good choice.

The other issue is that analyzing it took sooooo long. We may introduce a strategy to make that unnotable for the user. Something like a maintenance thread that runs only when no other cachingreader is active.

[Swiftb0y (swiftb0y)]

Mixxx now uses GitHub for bug tracking. This bug has been migrated to:
https://github.com/mixxxdj/mixxx/issues/9061