added selection range provider support to lsp capabilities#1657
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added selection range provider support to lsp capabilities#1657
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Implements the LSP textDocument/selectionRange request, which allows clients to request a set of expanded selection ranges for given cursor positions. Each response is a linked list of ranges from innermost to outermost, giving clients a syntactically-aware path from the cursor outward through the AST.
The server now advertises selectionRangeProvider: true in its capabilities. When a request comes in, it finds the deepest AST node at each position, prepends the exact lexer token range as the tightest step (handling cases like AssignmentStatement.name which is stored as a raw Token rather than a child AST node), then walks the .parent chain collecting each node's range — deduplicating any consecutive identical ranges along the way.