Update vscode-languageclient to 8.0.2 #1327
Merged
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The vscode-languageclient library introduced breaking API changes in the 8.X version that require changes to our extension to use:
In addition to the above were interface changes to ErrorHandler. In applying these changes, it introduced duplicate error messages when loading the extension with incorrect settings. In effect, turning 1 or 2 messages into 3 or 4, depending on what was misconfigured. These cannot be customized: microsoft/vscode-languageserver-node#1011
This commit solves this by removing use of the ExtensionErrorHandler class and instead using inline methods for both initializationFailedHandler and errorHandler to detect failed extension errors. It avoids the duplicate methods by not using the ErrorAction message property and instead keeping track of whether or not an InitializeError was detected.