Fix terminal screen reader support when set to auto

Part of #59794

src/vs/workbench/parts/terminal/electron-browser/terminalInstance.ts

@@ -3,6 +3,7 @@
  *  Licensed under the MIT License. See License.txt in the project root for license information.
  *--------------------------------------------------------------------------------------------*/
 
+import * as browser from 'vs/base/browser/browser';
 import * as lifecycle from 'vs/base/common/lifecycle';
 import * as nls from 'vs/nls';
 import * as platform from 'vs/base/common/platform';
@@ -31,7 +32,6 @@ import { IClipboardService } from 'vs/platform/clipboard/common/clipboardService
 import { ansiColorIdentifiers, TERMINAL_BACKGROUND_COLOR, TERMINAL_FOREGROUND_COLOR, TERMINAL_CURSOR_FOREGROUND_COLOR, TERMINAL_CURSOR_BACKGROUND_COLOR, TERMINAL_SELECTION_BACKGROUND_COLOR } from 'vs/workbench/parts/terminal/common/terminalColorRegistry';
 import { PANEL_BACKGROUND } from 'vs/workbench/common/theme';
 import { IConfigurationService, ConfigurationTarget } from 'vs/platform/configuration/common/configuration';
-import { IEditorOptions } from 'vs/editor/common/config/editorOptions';
 import { INotificationService, Severity, IPromptChoice } from 'vs/platform/notification/common/notification';
 import { ILogService } from 'vs/platform/log/common/log';
 import { TerminalCommandTracker } from 'vs/workbench/parts/terminal/node/terminalCommandTracker';
@@ -399,7 +399,6 @@ export class TerminalInstance implements ITerminalInstance {
 			Terminal.strings.promptLabel = nls.localize('terminal.integrated.a11yPromptLabel', 'Terminal input');
 			Terminal.strings.tooMuchOutput = nls.localize('terminal.integrated.a11yTooMuchOutput', 'Too much output to announce, navigate to rows manually to read');
 		}
-		const accessibilitySupport = this._configurationService.getValue<IEditorOptions>('editor').accessibilitySupport;
 		const font = this._configHelper.getFont(undefined, true);
 		const config = this._configHelper.config;
 		this._xterm = new Terminal({
@@ -413,7 +412,7 @@ export class TerminalInstance implements ITerminalInstance {
 			letterSpacing: font.letterSpacing,
 			lineHeight: font.lineHeight,
 			bellStyle: config.enableBell ? 'sound' : 'none',
-			screenReaderMode: accessibilitySupport === 'on',
+			screenReaderMode: this._isScreenReaderOptimized(),
 			macOptionIsMeta: config.macOptionIsMeta,
 			macOptionClickForcesSelection: config.macOptionClickForcesSelection,
 			rightClickSelectsWord: config.rightClickBehavior === 'selectWord',
@@ -450,6 +449,12 @@ export class TerminalInstance implements ITerminalInstance {
 		this._disposables.push(this._themeService.onThemeChange(theme => this._updateTheme(theme)));
 	}
 
+	private _isScreenReaderOptimized(): boolean {
+		const detected = browser.getAccessibilitySupport() === platform.AccessibilitySupport.Enabled;
+		const config = this._configurationService.getValue('editor.accessibilitySupport');
+		return config === 'on' || (config === 'auto' && detected);
+	}
+
 	public reattachToElement(container: HTMLElement): void {
 		if (!this._wrapperElement) {
 			throw new Error('The terminal instance has not been attached to a container yet');
@@ -1110,8 +1115,7 @@ export class TerminalInstance implements ITerminalInstance {
 	}
 
 	public updateAccessibilitySupport(): void {
-		const value = this._configurationService.getValue('editor.accessibilitySupport');
-		this._xterm.setOption('screenReaderMode', value === 'on');
+		this._xterm.setOption('screenReaderMode', this._isScreenReaderOptimized());
 	}
 
 	private _setCursorBlink(blink: boolean): void {