Enforce unsupported boolean flag for MarkdownString in chat

Author: roblourens

src/vs/workbench/api/common/extHostTypes.ts

@@ -4272,6 +4272,10 @@ export enum ChatResultFeedbackKind {
 export class ChatResponseMarkdownPart {
 	value: vscode.MarkdownString;
 	constructor(value: string | vscode.MarkdownString) {
+		if (typeof value !== 'string' && value.isTrusted === true) {
+			throw new Error('The boolean form of MarkdownString.isTrusted is NOT supported for chat participants.');
+		}
+
 		this.value = typeof value === 'string' ? new MarkdownString(value) : value;
 	}
 }
@@ -4284,6 +4288,10 @@ export class ChatResponseMarkdownWithVulnerabilitiesPart {
 	value: vscode.MarkdownString;
 	vulnerabilities: vscode.ChatVulnerability[];
 	constructor(value: string | vscode.MarkdownString, vulnerabilities: vscode.ChatVulnerability[]) {
+		if (typeof value !== 'string' && value.isTrusted === true) {
+			throw new Error('The boolean form of MarkdownString.isTrusted is NOT supported for chat participants.');
+		}
+
 		this.value = typeof value === 'string' ? new MarkdownString(value) : value;
 		this.vulnerabilities = vulnerabilities;
 	}