Danny Tuppeny
800421bc60
This is a no-op refactor extracted from an upcoming change to enable the onWillRenameFiles request to work for LSP over the Legacy protocol. It's mostly lifting some API from the LSP server to the base server and some into a new mixin (`LspVerifyEditHelpersMixin`) to provide the required methods for verifying edits without the usual LSP base test classes. Change-Id: Id6084a80e3afb9c6af1a84d9e8a18d460b5f4cce Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/329980 Commit-Queue: Keerti Parthasarathy <keertip@google.com> Reviewed-by: Keerti Parthasarathy <keertip@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>