Added an optional per-server languageId override and used it for both disk-backed and in-memory didOpen notifications. Covered config loading and both document-open paths with a fake custom GDScript server. Fixes #6800
Added an optional per-server languageId override and used it for both disk-backed and in-memory didOpen notifications. Covered config loading and both document-open paths with a fake custom GDScript server. Fixes #6800