use session-unique region keys for semantic tokens #2517
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I've noticed an issue with semantic tokens being removed when restarting a session that doesn't provide semantic tokens, when there is also another session active that provides semantic tokens.
In this case there are both LSP-typescript and LSP-volar sessions active in the view and LSP-typescript is the one that provides semantic tokens. On restarting LSP-volar, semantic tokens disappear and don't show up until changing the document or restarting LSP-typescript:
Screen.Recording.2024-09-21.at.23.37.56.mov
I've made semantic token regions session-specific so that initializing a session doesn't overwrite existing semantic token regions.