Filter unsupported items from 'Add Context' quick pick (#270660)

src/vs/workbench/contrib/chat/browser/actions/chatContextActions.ts

@@ -51,6 +51,9 @@ import { resizeImage } from '../imageUtils.js';
 import { registerPromptActions } from '../promptSyntax/promptFileActions.js';
 import { CHAT_CATEGORY } from './chatActions.js';
 
+// Schemes that should not be available for chat context attach
+const UNSUPPORTED_CONTEXT_SCHEMES = new Set(['webview-panel', 'walkThrough', 'vscode-settings']);
+
 export function registerChatContextActions() {
 	registerAction2(AttachContextAction);
 	registerAction2(AttachFileToChatAction);
@@ -455,6 +458,12 @@ export class AttachContextAction extends Action2 {
 		const commandService = accessor.get(ICommandService);
 
 		const providerOptions: AnythingQuickAccessProviderRunOptions = {
+			filter: (pick) => {
+				if (isIQuickPickItemWithResource(pick) && pick.resource) {
+					return !UNSUPPORTED_CONTEXT_SCHEMES.has(pick.resource.scheme);
+				}
+				return true;
+			},
 			additionPicks,
 			handleAccept: async (item: IQuickPickServicePickItem | IContextPickItemItem, isBackgroundAccept: boolean) => {