src/vs/workbench/api/common/extHostFileSystem.ts/ExtHostFileSystem/_registerLinkProviderIfNotYetRegistered
class ExtHostFileSystem:	private _registerLinkProviderIfNotYetRegistered(): void {
		if (!this._linkProviderRegistration) {
			this._linkProviderRegistration = this._extHostLanguageFeatures.registerDocumentLinkProvider(undefined, '*', this._linkProvider);
		}
	}