Convert PsesSignatureHelpHandler to inherit SignatureHelpHandlerBase

Author: andyleejordan

src/PowerShellEditorServices/Services/TextDocument/Handlers/SignatureHelpHandler.cs

@@ -17,15 +17,13 @@
 
 namespace Microsoft.PowerShell.EditorServices.Handlers
 {
-    internal class PsesSignatureHelpHandler : ISignatureHelpHandler
+    internal class PsesSignatureHelpHandler : SignatureHelpHandlerBase
     {
         private readonly ILogger _logger;
         private readonly SymbolsService _symbolsService;
         private readonly WorkspaceService _workspaceService;
         private readonly PowerShellContextService _powerShellContextService;
 
-        private SignatureHelpCapability _capability;
-
         public PsesSignatureHelpHandler(
             ILoggerFactory factory,
             SymbolsService symbolsService,
@@ -38,17 +36,14 @@ public PsesSignatureHelpHandler(
             _powerShellContextService = powerShellContextService;
         }
 
-        public SignatureHelpRegistrationOptions GetRegistrationOptions()
+        protected override SignatureHelpRegistrationOptions CreateRegistrationOptions(SignatureHelpCapability capability, ClientCapabilities clientCapabilities) => new SignatureHelpRegistrationOptions
         {
-            return new SignatureHelpRegistrationOptions
-            {
-                DocumentSelector = LspUtils.PowerShellDocumentSelector,
-                // A sane default of " ". We may be able to include others like "-".
-                TriggerCharacters = new Container<string>(" ")
-            };
-        }
+            DocumentSelector = LspUtils.PowerShellDocumentSelector,
+            // A sane default of " ". We may be able to include others like "-".
+            TriggerCharacters = new Container<string>(" ")
+        };
 
-        public async Task<SignatureHelp> Handle(SignatureHelpParams request, CancellationToken cancellationToken)
+        public override async Task<SignatureHelp> Handle(SignatureHelpParams request, CancellationToken cancellationToken)
         {
             if (cancellationToken.IsCancellationRequested)
             {
@@ -95,11 +90,6 @@ await _symbolsService.FindParameterSetsInFileAsync(
             };
         }
 
-        public void SetCapability(SignatureHelpCapability capability)
-        {
-            _capability = capability;
-        }
-
         private static ParameterInformation CreateParameterInfo(ParameterInfo parameterInfo)
         {
             return new ParameterInformation