Auto-Library Rescan conditions

[GomuSkelly]

Feature Description

#14129

"Implementing an option, to define in seconds/minutes/hours the time between Mixxx automatically rescanning the Library would be of benefit."

In the MozAIk use case #14129, there can be new material generating every few seconds.

For users with vast Libraries, we're not sure how slowly a Library Rescan occurs.

In such scenarios, it may be preferrable to localise Library Rescans to a single directory under which newly generated material is being added, to negate the time/resources otherwise required to reprocess the entire Library.

Potentially having two options - Full Auto-Library Rescan and Auto-Directory Rescan could address this.

[ronso0]

Related requests:
#13989
#8532

[GomuSkelly]

Here's a 1080 video playing with generated material across 4 Decks:

https://www.youtube.com/watch?v=iJW8diFjkqY

In this experiment, the AutoDJ plays material on Decks 1+2 generated using the prompt "160bpm birds trap dubstep jungle" which creates sparse rhythmic material with no melody, and some rhythmic birdsong.

Decks 3+4 are being DJ'd manually with material generated from both sonic texture prompts (e.g "160bpm birds"/"160bpm male vocals") and music prompts (e.g"160bpm trap heaven church dubstep jungle"), but in contrast to what was described here #14129 in this instance the sonic texture also contains "160bpm" in the prompt which generates the sonic texture with rhythm.