Show progress when clearing data from multiple tracks

[mixxxbot]

Reported by: Pegasus-RPG
Date: 2018-04-19T22:05:32Z
Status: Confirmed
Importance: Wishlist
Launchpad Issue: lp1765528
Tags: library

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Following the instructions for upgrading from 2.0 to 2.1 regarding MP3 files, the GUI appears to hang while hundreds of files have their BPM and beatgrids as well as Waveforms cleared.

It would be nice if a) the GUI didn't hang and b) there was a progress bar for this operation when done on say more than 10 tracks, like the library scanner has.

[mixxxbot]

Commented by: uklotzde
Date: 2018-04-19T22:33:09Z

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This issue is valid for all actions that are applied on multiple tracks and should therefore be implemented in a more generic, reusable way.

Code from the new TrackAnalysisScheduler class that internally uses a queue might help here. But in contrast to track analyzers these simple track actions do not need to be executed in separate worker threads.

[mixxxbot]

Duplicate of #8480