[clangd] Add InsertReplaceEdit for code completion (#187623) Handle new insertReplaceSupport capability (defined in LSP 3.16). Add the new option to the protocol layer and pass it around to the code completion logic. Update CompletionItem::textEdit to become the union type as per the LSP specification. Add a new helper function to the Lexer public API to find the end of an identifier with full context lexing, to avoid duplicating the logic. Use the helper both in the Sema flow and in the comment completion flow. Use a simpler ASCII-only scan in no-Sema mode. Add LIT tests to verify auto-triggered completions, mid-word replacement, Unicode, and snippets. Add unit tests to verify insert/replace ranges with and without Sema, including comments and the feature-off case. Update the release notes to document the new capability. Fixes https://github.com/clangd/clangd/issues/2190 --------- Co-authored-by: timon-ul <timon.ulrich@advantest.com>
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