Register Language Server Client Proposed Features - Enabling Semantic Highlighting (#2834)

* registered proposed features for enabling semantic tokens

* Update theme.json

* Added comment clarifying why registering features is needed

Co-authored-by: Tyler James Leonhardt <tylerl0706@gmail.com>

Co-authored-by: Justin Chen <t-chenju@microsoft.com>
Co-authored-by: Tyler James Leonhardt <tylerl0706@gmail.com>

Author: 3 people

src/session.ts

@@ -549,6 +549,9 @@ export class SessionManager implements Middleware {
                     connectFunc,
                     clientOptions);
 
+            // This enables handling Semantic Highlighting messages in PowerShell Editor Services
+            this.languageServerClient.registerProposedFeatures();
+
             this.languageServerClient.onReady().then(
                 () => {
                     this.languageServerClient

themes/theme-psise/theme.json

@@ -1,5 +1,6 @@
 {
 	"name": "PowerShell ISE",
+	"semanticHighlighting": true,
 	"tokenColors": [
 		{
 			"settings": {