Duplicate client/registerCapability for workspace/executeCommand

[deathaxe]

With regards to sublimelsp/LSP-lemminx#9

It appears LemMinX tries to register workspace/executeCommand twice.

One instance for xml.validation.current.file and one for xml.validation.all.files command.

With a birds eye onto https://microsoft.github.io/language-server-protocol/specifications/specification-3-15 I'd expect one registration message for workspace/executeCommand with commands containing a list of all available commands.

Console log:

LSP: lemminx: registering capability: codeActionProvider
LSP: lemminx: registering capability: completionProvider
LSP: lemminx: registering capability: documentHighlightProvider
LSP: lemminx: registering capability: hoverProvider
LSP: lemminx: registering capability: renameProvider
LSP: lemminx: registering capability: definitionProvider
LSP: lemminx: registering capability: typeDefinitionProvider
LSP: lemminx: registering capability: referencesProvider
LSP: lemminx: registering capability: documentFormattingProvider
LSP: lemminx: registering capability: rangeFormattingProvider
LSP: lemminx: registering capability: documentSymbolProvider
LSP: lemminx: registering capability: executeCommandProvider
LSP: lemminx: registering capability: executeCommandProvider
LSP: executeCommandProvider is already registered at executeCommandProvider.id with ID 8dce5c84-5665-4060-84d6-c58ebedc49d7, overwriting

Communication log:

:: <-- lemminx client/registerCapability(12): {'registrations': [{'registerOptions': {'id': '8dce5c84-5665-4060-84d6-c58ebedc49d7', 'commands': ['xml.validation.current.file']}, 'id': '8dce5c84-5665-4060-84d6-c58ebedc49d7', 'method': 'workspace/executeCommand'}]}
:: >>> lemminx 12: None
:: <-- lemminx client/registerCapability(13): {'registrations': [{'registerOptions': {'id': '2dbb8863-94a3-45eb-99b9-a78343e3f591', 'commands': ['xml.validation.all.files']}, 'id': '2dbb8863-94a3-45eb-99b9-a78343e3f591', 'method': 'workspace/executeCommand'}]}
:: >>> lemminx 13: None

[angelozerr]

@deathaxe I try to fix your issue (very quckly with #938) could you tell meif it work for you. Thanks!

@BoykoAlex could you review my PR please? I needto manage the unregister commands.