Only set engine options that change value

[franciscoBSalgueiro]

No description provided.

[harshil21]

Does this fix the issue where the engine re-evaluates the position when I go back one move? I'd like en croissant to "remember" the best moves. Apparently this feature is called as "persistent hashing"? As an example, I was using https://github.com/fitztrev/lichess-tauri before this and on the lichess.org analysis page, the engine/lichess "remembered" the best moves without recalculating every time I went back one move.

[dav1312]

Does this fix the issue where the engine re-evaluates the position when I go back one move? I'd like en croissant to "remember" the best moves. Apparently this feature is called as "persistent hashing"? As an example, I was using fitztrev/lichess-tauri before this and on the lichess.org analysis page, the engine/lichess "remembered" the best moves without recalculating every time I went back one move.

It should for engines like Stockfish because setting the number of threads cleares the hash.