Merge pull request #3172 from KKoukiou/a11y-fix

Fix a11y violation because of using role='listitem' without role='list' parent

src/browser/AccessibilityManager.ts

@@ -56,6 +56,7 @@ export class AccessibilityManager extends Disposable {
     this._accessibilityTreeRoot.classList.add('xterm-accessibility');
 
     this._rowContainer = document.createElement('div');
+    this._rowContainer.setAttribute('role', 'list');
     this._rowContainer.classList.add('xterm-accessibility-tree');
     this._rowElements = [];
     for (let i = 0; i < this._terminal.rows; i++) {