LMMS / LMMS/lmms

Save CPU by not process other track when solo is on

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core enhancement performance
Dominant language
C++
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Avg merge
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Description

### Enhancement Summary

As the CPU still at the red when turn on solo, it is going to be better if there is an option to not process other track when solo is on.
Can be reproduced when right after stop playing, quickly turn of solo and hear the sound(need reverb or echo)

https://github.com/user-attachments/assets/4a811936-c153-4c6e-959b-cb92b121e8f6

### Implementation Details / Mockup

Make it an option in settings tab

### Please search the issue tracker for existing feature requests before submitting your own.

- [X] I have searched all existing issues and confirmed that this is not a duplicate.

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

The issue names only the settings tab and solo behavior; it does not identify files, tests, or an entry point. Start by locating the settings tab and the code handling solo playback and other-track processing. Done means providing an option that avoids processing other tracks while solo is enabled and preserves the described reverb or echo behavior when solo is turned off.

Written by the indexing model from the issue text.

Assessment

Tech stack
cpp
Domain
desktop
Issue type
Feature
Difficulty
5/5
Estimated time
Over a week
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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