External engines: waiting for external engine blocks the UI

[Siderite]

Exact URL of where the bug happened

Wherever you use local computer engine evaluation (Analysis Board or Study or Game analysis)

Steps to reproduce the bug

1. Configure local external engine via Tauri
2. Turn on computer engine on a position
3. while loading - which takes too long anyway - try to make a move

What did you expect to happen?

I expected the move to be made instantly and the analysis be aborted and restarted on the resulting position.

What happened instead?

The move did not happen until the analysis started, after which the analysis started again. Meanwhile the UI was blocked.

Operating system

Any

Browser and version (or alternate access method)

Any

Additional information

This is not because of CPU usage, I configured SF to be run with just 5 of 8 cores just to verify that.