92d9ca7d64
minor: Allow multiple snippet edits in a `TextDocumentEdit`
Explicitly[^1] allow a single `TextDocumentEdit` to have multiple `SnippetTextEdit`s. This allows things like renaming extracted variables and functions without having to go through a separate rename step. For an example of what this looks like, see the video in [this comment](https://github.com/microsoft/vscode/issues/145374#issuecomment-1177341711).
The behavior described here lines up with [what VSCode does](bdc113ffe1/src/vscode-dts/vscode.d.ts (L3728-L3731)), and presumably what the eventual LSP behavior will be.
[^1]: This was technically the case before #15269, a single `TextDocumentEdit` always had multiple edits which were `InsertTextFormat.Snippet` as all of the edits were marked as being snippets, even if there weren't any tab stops or placeholders.
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