Escape markdown in prepare message (#6406)

Fixes #6342

Author: alexr00

src/issues/util.ts

@@ -728,6 +728,10 @@ export function getRootUriFromScmInputUri(uri: vscode.Uri): vscode.Uri | undefin
 	return rootUri ? vscode.Uri.parse(rootUri) : undefined;
 }
 
+export function escapeMarkdown(text: string): string {
+	return text.replace(/([_~*])/g, '\\$1');
+}
+
 export class PlainTextRenderer extends marked.Renderer {
 	code(code: string): string {
 		return code;

src/lm/tools/searchTools.ts

@@ -8,6 +8,7 @@ import * as vscode from 'vscode';
 import Logger from '../../common/logger';
 import { FolderRepositoryManager } from '../../github/folderRepositoryManager';
 import { ILabel } from '../../github/interface';
+import { escapeMarkdown } from '../../issues/util';
 import { concatAsyncIterable, RepoToolBase } from './toolsUtils';
 
 interface ConvertToQuerySyntaxParameters {
@@ -432,7 +433,7 @@ export class SearchTool extends RepoToolBase<SearchToolParameters> {
 		const parameterQuery = options.parameters.query;
 
 		return {
-			invocationMessage: vscode.l10n.t('Searching for issues with "{0}". [Open on GitHub.com]({1})', parameterQuery, this.toGitHubUrl(parameterQuery))
+			invocationMessage: vscode.l10n.t('Searching for issues with "{0}". [Open on GitHub.com]({1})', escapeMarkdown(parameterQuery), escapeMarkdown(this.toGitHubUrl(parameterQuery)))
 		};
 	}